Inspection Lot creation related to multiple GRs

Hi all

I have the following scenario:

We are doing multiple GRs for the same material/batch/PO combination and want these to update the same inspection lot as QI stock. However once we have done a positive UD for this inspection lot if we get another receipts for this combination we want to create a new inspection lot.

From using the indicators on the material master, I can't get this to happen as all the subsequent GRs once the UD is carried out post to unrestricted stock as I guess SAP thinks that the inspection is finished for this combination.

Any ideas ?

Thanks in advance.

Alistair