IS SUPPLIED optional parameter

Hello gurus,

I have the following question: If I use the "IS SUPPLIED" clause in a condition during Class or Function Module testing, I do not know how to force a variable to not "be supplied" (so then, the 'IF [variable] IS SUPPLIED' clause can become false).

The variable of the input interface, so far for me, is always initial and supplied.

Does anyone know how to solve this issue?

Thanks!,

Eloi