bcquality/microsoft/knowledge/upgrade/install-and-upgrade-codeunits-have-no-order.md
Jesper Schulz-Wedde 56b80e6dcf Add knowledge-backed AL development
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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2026-09-04 12:53:54 +02:00

1.4 KiB

bc-version domain keywords technologies countries application-area
all
upgrade
install-codeunit
upgrade-codeunit
execution-order
subtype-install
subtype-upgrade
sequencing
al
w1
all

Separate install or upgrade codeunits have no execution order

Description

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.

Best Practice

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.

See sample: install-and-upgrade-codeunits-have-no-order.good.al.

Anti Pattern

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.

See sample: install-and-upgrade-codeunits-have-no-order.bad.al.

Reference

Create proper installation and upgrade codeunits