alguidelines/navpatterns/1-patterns/conditional-cascading-update/index.html
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<ul class=topics>
<li data-nav-id=/welcome/ title=Welcome class=dd-item><a href=/welcome/><b><i class="fas fa-home"></i> </b>Welcome</a><ul></ul></li>
<li data-nav-id=/bcpatterns/ title="BC Patterns" class=dd-item><a href=/bcpatterns/><b><i class="fas fa-clone"></i> </b>BC Patterns</a><ul>
<li data-nav-id=/bcpatterns/facade-pattern/ title="Facade Pattern" class=dd-item><a href=/bcpatterns/facade-pattern/>Facade Pattern</a></li>
<li data-nav-id=/bcpatterns/generic-method-pattern/ title="Generic Method Pattern" class=dd-item><a href=/bcpatterns/generic-method-pattern/>Generic Method Pattern</a></li></ul></li>
<li data-nav-id=/bcbestpractices/ title="BC Dev. Best Practices" class=dd-item><a href=/bcbestpractices/><b><i class="fas fa-medal"></i> </b>BC Dev. Best Practices</a><ul>
<li data-nav-id=/bcbestpractices/readability/ title=Readability class=dd-item><a href=/bcbestpractices/readability/>Readability</a><ul>
<li data-nav-id=/bcbestpractices/readability/begin-as-an-afterword/ title="begin as an 'After Word'" class=dd-item><a href=/bcbestpractices/readability/begin-as-an-afterword/>begin as an 'After Word'</a></li>
<li data-nav-id=/bcbestpractices/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/bcbestpractices/readability/begin-end/>Begin-End - Compound Only</a></li>
<li data-nav-id=/bcbestpractices/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/bcbestpractices/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
<li data-nav-id=/bcbestpractices/readability/comments-spacing/ title="Comment Spacing" class=dd-item><a href=/bcbestpractices/readability/comments-spacing/>Comment Spacing</a></li>
<li data-nav-id=/bcbestpractices/readability/end-else-pair/ title="end else pair" class=dd-item><a href=/bcbestpractices/readability/end-else-pair/>end else pair</a></li>
<li data-nav-id=/bcbestpractices/readability/keyword-pairs-indentation/ title="Keyword Pairs - Indentation" class=dd-item><a href=/bcbestpractices/readability/keyword-pairs-indentation/>Keyword Pairs - Indentation</a></li>
<li data-nav-id=/bcbestpractices/readability/line-start-keywords/ title="Line Start Keywords" class=dd-item><a href=/bcbestpractices/readability/line-start-keywords/>Line Start Keywords</a></li>
<li data-nav-id=/bcbestpractices/readability/lonely-repeat/ title="Lonely Repeat" class=dd-item><a href=/bcbestpractices/readability/lonely-repeat/>Lonely Repeat</a></li>
<li data-nav-id=/bcbestpractices/readability/named-invocations/ title="Named Invocations" class=dd-item><a href=/bcbestpractices/readability/named-invocations/>Named Invocations</a></li>
<li data-nav-id=/bcbestpractices/readability/one-statement-per-line/ title="One Statement Per Line" class=dd-item><a href=/bcbestpractices/readability/one-statement-per-line/>One Statement Per Line</a></li>
<li data-nav-id=/bcbestpractices/readability/separate-if-and-else/ title="Separate if and else" class=dd-item><a href=/bcbestpractices/readability/separate-if-and-else/>Separate if and else</a></li>
<li data-nav-id=/bcbestpractices/readability/spacing-binary-operators/ title="Spacing Binary Operators" class=dd-item><a href=/bcbestpractices/readability/spacing-binary-operators/>Spacing Binary Operators</a></li>
<li data-nav-id=/bcbestpractices/readability/suggested-abbreviations/ title="Suggested Abbreviations" class=dd-item><a href=/bcbestpractices/readability/suggested-abbreviations/>Suggested Abbreviations</a></li>
<li data-nav-id=/bcbestpractices/readability/unnecessary-else/ title="Unnecessary 'else'" class=dd-item><a href=/bcbestpractices/readability/unnecessary-else/>Unnecessary 'else'</a></li>
<li data-nav-id=/bcbestpractices/readability/unnecessary-truefalse/ title="Unnecessary true/false" class=dd-item><a href=/bcbestpractices/readability/unnecessary-truefalse/>Unnecessary true/false</a></li>
<li data-nav-id=/bcbestpractices/readability/variable-naming/ title="Variable Naming" class=dd-item><a href=/bcbestpractices/readability/variable-naming/>Variable Naming</a></li>
<li data-nav-id=/bcbestpractices/readability/variables-declarations-order/ title="Variables Declarations Order" class=dd-item><a href=/bcbestpractices/readability/variables-declarations-order/>Variables Declarations Order</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/ title="NAV Patterns Archive" class="dd-item parent"><a href=/navpatterns/><b><i class="fas fa-save"></i> </b>NAV Patterns Archive</a><ul>
<li data-nav-id=/navpatterns/1-patterns/ title="1. Patterns" class="dd-item parent"><a href=/navpatterns/1-patterns/>1. Patterns</a><ul>
<li data-nav-id=/navpatterns/1-patterns/activity-log/ title="Activity Logs" class=dd-item><a href=/navpatterns/1-patterns/activity-log/>Activity Logs</a></li>
<li data-nav-id=/navpatterns/1-patterns/argument-table/ title="Argument Table" class=dd-item><a href=/navpatterns/1-patterns/argument-table/>Argument Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/ title="Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/>Blocked Entity</a><ul>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/ title="Data Driven Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/>Data Driven Blocked Entity</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/cached-web-service-calls/ title="Cached Web Server Calls" class=dd-item><a href=/navpatterns/1-patterns/cached-web-service-calls/>Cached Web Server Calls</a></li>
<li data-nav-id=/navpatterns/1-patterns/conditional-cascading-update/ title="Conditional Cascading Update" class="dd-item active"><a href=/navpatterns/1-patterns/conditional-cascading-update/>Conditional Cascading Update</a></li>
<li data-nav-id=/navpatterns/1-patterns/copy-document/ title="Copy Document" class=dd-item><a href=/navpatterns/1-patterns/copy-document/>Copy Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-data-from-templates/ title="Create Data from Templates" class=dd-item><a href=/navpatterns/1-patterns/create-data-from-templates/>Create Data from Templates</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-urls-to-nav-clients/ title="Create URLs to NAV Clients" class=dd-item><a href=/navpatterns/1-patterns/create-urls-to-nav-clients/>Create URLs to NAV Clients</a></li>
<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
<li data-nav-id=/navpatterns/1-patterns/cross-session-events/ title="Cross Session Events" class=dd-item><a href=/navpatterns/1-patterns/cross-session-events/>Cross Session Events</a></li>
<li data-nav-id=/navpatterns/1-patterns/currently-active-record/ title="Currently Active Record" class=dd-item><a href=/navpatterns/1-patterns/currently-active-record/>Currently Active Record</a></li>
<li data-nav-id=/navpatterns/1-patterns/data-migration-facade/ title="Data Migration Façade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Façade</a></li>
<li data-nav-id=/navpatterns/1-patterns/discovery-event/ title="Discovery Event" class=dd-item><a href=/navpatterns/1-patterns/discovery-event/>Discovery Event</a></li>
<li data-nav-id=/navpatterns/1-patterns/document/ title=Document class=dd-item><a href=/navpatterns/1-patterns/document/>Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/ title="Easy Update Of Setup Or Supplementary Information" class=dd-item><a href=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/>Easy Update Of Setup Or Supplementary Information</a></li>
<li data-nav-id=/navpatterns/1-patterns/error-message-processing/ title="Error Message Processing" class=dd-item><a href=/navpatterns/1-patterns/error-message-processing/>Error Message Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/extending-the-role-center-headlines/ title="Extending the Role Center Headlines" class=dd-item><a href=/navpatterns/1-patterns/extending-the-role-center-headlines/>Extending the Role Center Headlines</a></li>
<li data-nav-id=/navpatterns/1-patterns/feature-localization-for-data-structures/ title="Feature Localization For Data Structures" class=dd-item><a href=/navpatterns/1-patterns/feature-localization-for-data-structures/>Feature Localization For Data Structures</a></li>
<li data-nav-id=/navpatterns/1-patterns/hooks/ title=Hooks class=dd-item><a href=/navpatterns/1-patterns/hooks/>Hooks</a></li>
<li data-nav-id=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ title="Surrogate keys using Autoincrement Pattern" class=dd-item><a href=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/>Surrogate keys using Autoincrement Pattern</a></li>
<li data-nav-id=/navpatterns/1-patterns/instructions-in-the-ui/ title="Instructions in the UI" class=dd-item><a href=/navpatterns/1-patterns/instructions-in-the-ui/>Instructions in the UI</a></li>
<li data-nav-id=/navpatterns/1-patterns/integration-of-addresses/ title="Integration of Addresses" class=dd-item><a href=/navpatterns/1-patterns/integration-of-addresses/>Integration of Addresses</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-error-processing/ title="Journal Error Processing" class=dd-item><a href=/navpatterns/1-patterns/journal-error-processing/>Journal Error Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-template-batch-line/ title="Journal Template Batch Line" class=dd-item><a href=/navpatterns/1-patterns/journal-template-batch-line/>Journal Template Batch Line</a></li>
<li data-nav-id=/navpatterns/1-patterns/master-data/ title="Master Data" class=dd-item><a href=/navpatterns/1-patterns/master-data/>Master Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-file-download/ title="Multi-file Download" class=dd-item><a href=/navpatterns/1-patterns/multi-file-download/>Multi-file Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-page-list/ title="Multi-Page List" class=dd-item><a href=/navpatterns/1-patterns/multi-page-list/>Multi-Page List</a></li>
<li data-nav-id=/navpatterns/1-patterns/multilanguage-application-data/ title="Multilanguage Application Data" class=dd-item><a href=/navpatterns/1-patterns/multilanguage-application-data/>Multilanguage Application Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/ title="NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/>NET Exception Handling in CAL</a><ul>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ title="TryFunction NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/>TryFunction NET Exception Handling in CAL</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/no-series/ title="No Series" class=dd-item><a href=/navpatterns/1-patterns/no-series/>No Series</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/ title=Notifications class=dd-item><a href=/navpatterns/1-patterns/notifications/>Notifications</a><ul>
<li data-nav-id=/navpatterns/1-patterns/notifications/in-context-notifications/ title="In-context Notifications" class=dd-item><a href=/navpatterns/1-patterns/notifications/in-context-notifications/>In-context Notifications</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/ title="Notification Lifecycle Management Pattern" class=dd-item><a href=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/>Notification Lifecycle Management Pattern</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/observer/ title=Observer class=dd-item><a href=/navpatterns/1-patterns/observer/>Observer</a></li>
<li data-nav-id=/navpatterns/1-patterns/posting-routine-select-behavior/ title="Posting Routine - Select Behavior" class=dd-item><a href=/navpatterns/1-patterns/posting-routine-select-behavior/>Posting Routine - Select Behavior</a></li>
<li data-nav-id=/navpatterns/1-patterns/product-name/ title="Product Name" class=dd-item><a href=/navpatterns/1-patterns/product-name/>Product Name</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/ title=Queries class=dd-item><a href=/navpatterns/1-patterns/queries/>Queries</a><ul>
<li data-nav-id=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries" class=dd-item><a href=/navpatterns/1-patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ title="Use Queries to Detect Duplicate Records" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>Use Queries to Detect Duplicate Records</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/read-once-initialization-and-validation/ title="Read-once Initialization and Validation" class=dd-item><a href=/navpatterns/1-patterns/read-once-initialization-and-validation/>Read-once Initialization and Validation</a></li>
<li data-nav-id=/navpatterns/1-patterns/released-entity/ title="Released Entity" class=dd-item><a href=/navpatterns/1-patterns/released-entity/>Released Entity</a></li>
<li data-nav-id=/navpatterns/1-patterns/report-selection/ title="Report Selection" class=dd-item><a href=/navpatterns/1-patterns/report-selection/>Report Selection</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/ title=Security class=dd-item><a href=/navpatterns/1-patterns/security/>Security</a><ul>
<li data-nav-id=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/ title="Sensitive Data Encapsulation" class=dd-item><a href=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/>Sensitive Data Encapsulation</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/2-data-encryption/ title="Data Encryption" class=dd-item><a href=/navpatterns/1-patterns/security/2-data-encryption/>Data Encryption</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/3-single-point-of-access/ title="Single Point of Access" class=dd-item><a href=/navpatterns/1-patterns/security/3-single-point-of-access/>Single Point of Access</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/4-masked-text/ title="Masked Text" class=dd-item><a href=/navpatterns/1-patterns/security/4-masked-text/>Masked Text</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/5-ssl-in-nav/ title="SSL in NAV" class=dd-item><a href=/navpatterns/1-patterns/security/5-ssl-in-nav/>SSL in NAV</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/setup-specificity-fallback/ title="Setup Specificity Fallback" class=dd-item><a href=/navpatterns/1-patterns/setup-specificity-fallback/>Setup Specificity Fallback</a></li>
<li data-nav-id=/navpatterns/1-patterns/silent-file-upload-and-download/ title="Silent File Upload and Download" class=dd-item><a href=/navpatterns/1-patterns/silent-file-upload-and-download/>Silent File Upload and Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/ title=Singleton class=dd-item><a href=/navpatterns/1-patterns/singleton/>Singleton</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-codeunit/ title="Singleton Codeunit" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/ title="Singleton Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/>Singleton Table</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/cue-table/ title="Cue Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/cue-table/>Cue Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/setup-table/ title="Setup Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/setup-table/>Setup Table</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/standard-journal/ title="Standard Journal" class=dd-item><a href=/navpatterns/1-patterns/standard-journal/>Standard Journal</a></li>
<li data-nav-id=/navpatterns/1-patterns/temporary-dataset-report/ title="Temporary Dataset Report" class=dd-item><a href=/navpatterns/1-patterns/temporary-dataset-report/>Temporary Dataset Report</a></li>
<li data-nav-id=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/ title="Totals and Discounts on Subpages Sales and Purchases" class=dd-item><a href=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/>Totals and Discounts on Subpages Sales and Purchases</a></li>
<li data-nav-id=/navpatterns/1-patterns/transfer-custom-fields/ title="Transfer Custom Fields" class=dd-item><a href=/navpatterns/1-patterns/transfer-custom-fields/>Transfer Custom Fields</a></li>
<li data-nav-id=/navpatterns/1-patterns/variant-facade/ title="Variant Facade" class=dd-item><a href=/navpatterns/1-patterns/variant-facade/>Variant Facade</a></li></ul></li>
<li data-nav-id=/navpatterns/2-anti-patterns/ title="2. Anti-Patterns" class=dd-item><a href=/navpatterns/2-anti-patterns/>2. Anti-Patterns</a><ul>
<li data-nav-id=/navpatterns/2-anti-patterns/nav-upgrade/ title="Nav Upgrade" class=dd-item><a href=/navpatterns/2-anti-patterns/nav-upgrade/>Nav Upgrade</a></li>
<li data-nav-id=/navpatterns/2-anti-patterns/reusable-bugs/ title="Reusable Bugs" class=dd-item><a href=/navpatterns/2-anti-patterns/reusable-bugs/>Reusable Bugs</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ title="3. CAL Coding Guidelines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/>3. CAL Coding Guidelines</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/ title=Design class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/>Design</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/ title="By Reference Parameters" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/>By Reference Parameters</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/class-coupling/ title="Class Coupling" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/class-coupling/>Class Coupling</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/ title="Cyclomatic Complexity" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/>Cyclomatic Complexity</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/ title="Encapsulate Local Functionality" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/>Encapsulate Local Functionality</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/ title="FINDSET FINDFIRST FINDLAST" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/>FINDSET FINDFIRST FINDLAST</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/ title="Initialized Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/>Initialized Variables</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/ title="Maintainability Index" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/>Maintainability Index</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/parameter-placeholders/ title="Parameter Placeholders" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/parameter-placeholders/>Parameter Placeholders</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/static-object-invocation/ title="Static Object Invocation" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/static-object-invocation/>Static Object Invocation</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unreachable-code/ title="Unreachable Code" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unreachable-code/>Unreachable Code</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unused-initialized-variables/ title="Unused Initialized Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unused-initialized-variables/>Unused Initialized Variables</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unused-variables/ title="Unused Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unused-variables/>Unused Variables</a></li>
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<h1>Conditional Cascading Update</h1>
<p><em>Originally by Jan Hoek at IDYN</em></p>
<h2 id=abstract>Abstract</h2>
<p>The Conditional Cascading Update pattern is used to intelligently populate fields whose values depend on other field values. In this pattern description, the field triggering the update will be called &ldquo;source field&rdquo;, and the depending field will be called &ldquo;target field&rdquo;.</p>
<h2 id=description>Description</h2>
<p>The value of one table field sometimes depends on the value of another field, typically following an application-defined transformation (note that we&rsquo;re talking about transformations of field values here. This has nothing to do with e.g. form transformation), such as conversion to uppercase, removal of certain characters etc.</p>
<p>If the target field is non-editable, said transformation is usually the only way for the target field to receive new values, so no irreproducible information can be lost. However, if the target field is editable, the user may have cared enough to override the default (transformed) value, in which case revalidating the source field should not blindly replace the target field&rsquo;s value.</p>
<h2 id=usage>Usage</h2>
<p>In the OnValidate trigger of the source field, test if the target field value is either blank, or equal to the transformed value of the source field&rsquo;s previous contents. If it is, populate the target field&rsquo;s value with the transformed source field value. If it is not, do nothing (effectively preserving the value set by the user).</p>
<h2 id=nav-specific-example>NAV Specific Example</h2>
<p>In the base application, this pattern can be found in Search Name/Search Description fields, which are updated with the uppercase value from the corresponding Name/Description field when the latter is validated, only if the Search Name/Description in question is currently blank, or equal to the (uppercase equivalent) of the previous contents of the Name/Description field.</p>
<p><a href=3124.T18_5F00_Name_5F00_OnValidate.png><img src=3124.T18_5F00_Name_5F00_OnValidate.png alt=" "></a></p>
<p>In this particular case, the transformation between source and target fields is implicit and due to the different data types of the fields (text vs. code). Note how the field triggers of the Search Name field itself do not contain any logic linked to this pattern.</p>
<h2 id=consequences>Consequences</h2>
<p>There is a case when this pattern should not be used. If the target field is non-editable, this pattern will not add any value, since there won&rsquo;t be any user-overridden values to protect.</p>
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