Did you ever find a solution?

something like this should be done in the label VERIF_MOD instead

$VERIF_MOD

   #CODE HERE

Return

Try below code snippet

$AVANT_ACT

Case BOUT

  When "N"

      #You can write code here

Endcase

Return

Thankyou,

Shereef N

I think is better: AVANTBOUT Before item or button is executed if we are talking about an object.

Additional Info:

• APRES_CHOI After user has selected window option / Before the action is executed
  AVANTBOUT Before item or button is executed
• Menu action is executed
  EXEBOUT After button action is executed
  SETBOUT When window/buttons are redrawn (Window is refreshed)

If you do that:

$ACTION

   if GUSER="your AUS_COD" : infbox ACTION : endif

........

........

......

return

youy will see the X3 actions logic for the object: OUVRE, DEFTRANS, VARIANTE,etc. etc.

Best Regards!