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Managing ABL Applications
R-code Features and Functions : R-code CRCs and procedure integrity : Validating CRCs for schema triggers

Validating CRCs for schema triggers

When a database event occurs in your application (such as creating a record or assigning a field), OpenEdge checks whether the CRC of the corresponding trigger procedure matches the CRC in the trigger metaschema record. If it matches, OpenEdge executes the procedure. Otherwise, OpenEdge returns a run-time error.
Trigger CRC validation works for both r-code and source versions of a trigger procedure. For source versions, OpenEdge calculates the CRC during the session compile.