creating inspection lot during goods issue?

We have an interface between our custom PP system and SAP MM such that the PP system's 'production order' (repeat: NOT in SAP) generates a GI to cost center in SAP. 100% of all these pick requests are brought to inspection table, and a subset get inspected. If some items fail inspection, we might do a GI reversal and then return to vendor.

In contemplating putting in QM, I just wanted to confirm that the current interface design is a non-starter for any integration with QM. Obviously the inventory has been issued out of SAP before QM kicks in. I wanted to confirm this before suggesting re-architecting the interface.

Thanks, Vlad