Hi,
Your question is not clear....may i know why you are posting "GRN" to vendor stock? Is it subcontract scenario? you mentioned it as scheduling agreement. please clarify.
Now as per my undestanding, you want to post the FG/SFG from subcontractor to quality. If this is the case, either you maintain the stock type as quality inspection in MIGO-item level-where tab. or you maintain "post to inspection stock" indicator in FG/SFG material master QM view or PO delivery tab.
For blocking MIRO till quality clearence, mark "GR based IV" tick mark in PO invoice tab and make the tolerence settings in OMR6 as 0.
Hope its helpful.
Regards,
AKPT