GR/IR account not credited at Goods receipt.

Dear All,

I have booked invoice first for a material PO.

The accounting entries of the Invoice document are:

Vendor account Debit

GR/IR account Credit

Now I book goods receipt for the same PO.

The accounting entries of the GRN accounting document are:

Stock Account Debit

Price Difference Account Credit.

The material is valuated at Standard price.

There is no GR Non valuated indicator in PO.

PO is without an account assignment.

I want to know why GR/IR account is not balanced at the time of GR and it is going to Price difference account.

Also the value of the Goods receipt shown in PO history is Zero.

This is happening for a specific case only.

For same material with other PO it is working fine.

Your help will be appreciated.