Invoice verification with GR based IV for import PO

Hi all,

Kind advice required here.

We have an import PO where the vendor in VMR has the GR based IV indicator disabled which enables us paying up the custom duty IV.

Now we receive the goods in partial quantities and there are several GRs for the P.O.But whenever we go in for the IV of the GRs the system is accumulating the GR quantity and giving a single figure & quantity (due to that indicator in VMR ).

Is there any way by which we can make the IV on GRN basis?

Because it is requiring manual entries at the time of IV.

Thank you