Default Function Code (FC) When Transferring via Button

Lawson defines the default in the screen definition:

FC I I=Inquire

In this case, the default FC is "I" when you transfer to the screen via F8. But if you define a Lawson button to transfer to the same program, Lawson ignores the default and program starts with (A)dd or (C)hange, always the same, depending on the program:

2 PO-WINDOW W 12 CSWW SB PO20.1

The question is, can (I)nquiry or any other FC be forced on a button transfer?