Switching off BC_Substract

I try to use Phases for BIM for remodeling and renovations by using the properties. See this topic:

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I got it to work, but when I draw window in the new phase in an old wall. The opening is visible in the existing phase.

The problem seems to be in the BC_SUBTRACT layer because it is still doing his work even when switched off. Is there any way to change his behavior? Maybe if we can make sure that it is switch off when the GRAPHICOVERRIDE or the Typed plans tells him to do so, we can make it work.

Anybody an idea?

Thanks a lot!

Kind Regards,

Gerco

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