How to filter a field in classes and representations

SOLVED

Hi,

I'm a SAGE X3 Developer and I'm trying to filter a property (the ALOOKUP popup)  in classes and representations... I need something similar as FILTSUP / CRITERE that used to work in Classic Mode.

The highlighted field in the right (Artigo sem Ordem de Fabrico) is linked with the ITMMASTER table, and should only show the items with "FORMATO = CH" and  ARTIGO should be the same as the field also highlited and linked with ITMMASTER in the left side (Artigo). [picture 1]

Here is the popup window I'm talking about (the selection popup) I want to filter. [picture 2]

Best Regards