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30 lines
1.5 KiB
Markdown
30 lines
1.5 KiB
Markdown
---
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bc-version: [all]
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domain: upgrade
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keywords: [install-codeunit, upgrade-codeunit, execution-order, subtype-install, subtype-upgrade, sequencing]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Separate install or upgrade codeunits have no execution order
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## Description
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An extension can contain multiple `Install` or `Upgrade` codeunits, but Business Central does not guarantee the order in which codeunits of the same subtype execute. Upgrade trigger phases are ordered globally, yet one codeunit's `OnUpgradePerCompany` must not assume another codeunit's same-phase trigger already ran. Object ID and source-file order do not provide sequencing.
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## Best Practice
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Keep separate install or upgrade codeunits independent. When two steps have a real dependency, coordinate them from one owning trigger in the required order; use upgrade tags to make each completed step idempotent.
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See sample: [`install-and-upgrade-codeunits-have-no-order.good.al`](install-and-upgrade-codeunits-have-no-order.good.al).
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## Anti Pattern
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Splitting dependent steps into separate codeunits and relying on names, object IDs, or declaration order. The dependent codeunit can run first and fail or observe partially migrated data.
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See sample: [`install-and-upgrade-codeunits-have-no-order.bad.al`](install-and-upgrade-codeunits-have-no-order.bad.al).
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## Reference
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[Create proper installation and upgrade codeunits](https://learn.microsoft.com/en-us/training/modules/easy-application-upgrade/3-installation-upgrade-codeunits)
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