IR before GR

Hi experts,

We have a scenario where IR is done Before GR is done in the system.

Sometimes due to typing/input errors there are some mismatch in value or quantity..because of this after GR is done Moving average price of the material gets impacted of course respective accounting entries as well.

How to idendify such invoices (quantity/value) are not consistant with GR of the PO item.

Your help is highly appreciated.

Thanks in advance

Gobi