COMAC - which ATP check is done?

Dear all.

We want to use transaction COMAC in order to have a list of order that can be produced today.

If we now run the COMAC we got a good looking list with orders that does not have status MSPT.

But unfortunately if we try to relase these orders sometimes we fail, as there are missing part. So it seems that we have different scope of checks in the COMAC and during the release.

How can we check which kind of check is done during COMAC?

Thanks and best regards, André