PP PM integration (cost calculation in PM)

Dear Gurus,

i need urgently your help...

I'm working on an integration of PP in PM. So far I have set up the connection between these two modules. The cost for the maintenance can be showed in both the modules.

But the problem is:

The cost should only be calculated in PM, but not in PP. How can I realize it?

I appreciate your help very much !

Freundliche Grüsse / Best regards,

Cherian