Arch Top Window without upper transom, but as a double sash window

[Anonymous]

Hello!

I work with ArchiCAD 20 and 21 international and hungarian versions.

I would like to use an Arch Top Window without upper transom, but with double sash. If I turn out the upper transom, I can't choose Double Sash at Main Sash.

Is there a simple solution to this problem?

Thank you, Timea Szabo