>>If you have SET TALK OFF in your main program, that should be enough. Something in your application must set if on, I suggest you use Code reference and search for SET TALK.
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>I have SET TALK OFF in my main program... The problem is that SET TALK is scoped by data session, and my forms are private data session... So, SET TALK returns to ON when the form is created.

Add SET TALK OFF into BeforeOpenTables in DE.