Hi Ondrej,
The functionality to assign the include to a main program has been introduced recently. Therefore, you need the newest backend version 7.40 SP8 to change the setting. I am just confused about the error message. I would expect that it says it is currently not supported. We will check this.
Now when I remove Include statement from Z_PROG2, main program of Z_INCL1 will still be Z_INCL1 and I still cannot compile Z_INCL1 with the same error message even thougt it is now only included in 1 program again. I have to remove include statement also from Z_PROG1 and than I am able to compile Z_INCL1 again.
The information about the main programs is fetched from the backend, when the include is read. This happens either when the editor for the include is opened or when you press F5 in the editor or Project Explorer to refresh the include. If you do this after you remove the include statement in Z_PROG2, I would expect it to work.
Michael