Hi,
As per the setting in the customer info record 'Quality Inspection' tab, there are 3 cases.
1. Before delivery: In this case inspection lot is created and PGI is not allowed untill usage decision is completed.
2. After Delivery: In this case inspection lot is created and PGI is allowed even if usage decision is not done.
3. By Customer: In this case inspection lot is not created even though respective inspection type is maintained in the material master.
Case mentioned by you is different and is not possible in standard SAP. Hence you need to do the enhancement to cater your requirement.
Best Regards,
Gururaj Kulkarni