Business Central 27 made several 26.x issues official breaking changes, especially around events and posting routines. Instead of branching your extensions or rewriting logic for each upgrade, AL’s preprocessor directives let you control version-specific behavior cleanly.
This post walks through:
- Creating symbols (CLEAN26, CLEAN27)
- Wrapping logic with #if and #else
- Handling the NoSeriesManagement → “No. Series” transition
- Dealing with the Invoice Post. Buffer changes
Full guide with code samples and GitHub repo:
http://learnbeyondbc.com/blogs/bc-breaking-changes-al-preprocessor
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