BTW : I got a bit confused on the 087 inspection setup and in my reply I referenced 89. 89 is usually a manual inspection type. I'm not sure where you got the 087 inspection setup unless that is like a special one created for one of the specialized solutons like EWMS or something else.
STO's typically trigger an 08 inspectoin type in the plant receiving the STO if the 08 is activated there.
In standard ECC QM really doesn't care about APO. It does it's own thing. It's APO that cares about QM and uses the end-dates of the inspection lots in it's availability calculations if the lots existed. If an inspec. lot does not exist, but QM is active, it uses the GR processing time in it's calculation until such time as the lot gets created.
Craig