Using itempressed you can evaluate a click (mouse or keyboard)

 

windowevent itempressed 1

return no_action

 

If you want to overwrite or catch a SAP-function you have to use preitempressed

 

windowevent preitempressed 1

if <stationname> = whs then

  // Station whs is locked

  return success

end if

return no_action

 

MODE

Forms can have special modes.

Especially the Button "OK" has different functionality depending on the mode (refresh, add etc.). You can get the mode with form=mode (see form).