Is it possible to interrupt a planning sequence in FOX ?

Hi,

At the beginning of my planning sequence, I have to test a value with a FOX formula, if my value is wrong, I want to send a message to the WAD and stop the planning sequence, how to do this ?

I have tested with the EXIT statement but it seems not work.

The planning sequence is called by a button in the WAD.

Thanks a lot,

Regards,