>Maybe I should make a trigger on that table to save old and new values of quantity and see those cases when REPLACE failed.
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>Question:
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>How can I (in trigger procedure) know name of a form in which I replace data in table aa?

I never have done a trigger for anything.

If a replace fails how should a trigger be triggered?

Check ASTACKINFO() for callers

Again, there is no change to aa in the example you show.

Agnes