GR Value is not matching with PO Value while posting good receipt.

Hi Experts,

My client has raised the PO with accounts assignment category K (COST CENTRE) with material description.

but he has received invoice receipt before good receipt.while invoice receipt he has entered wrong value for some qty as per PO intially and cancelled that wrong entry.

I have gone through original & cancelled invoice document accounting entries. below is entries:

Original invoice document accounting entries:

GR/IR Clearing account: Debited

Vendor account: Credited

during cancelling the above document it should be vendor acc is debited and GR/IR account is credited but in the system below entries taken place

Cancelled invoice document accounting entries:

Vendor account : Debited

GR/IR Account : Credited

Consumption Account : Credited

Why consumption acc taken place here. pls help what are the possibilitis....

these entries affecting good receipt value means while taking goods receipt for some qty out of full qty value is not matching with PO value.

but while cancelling the GR documents system taking correct values as per PO. Please help.

Kindly help in this regards

Regards

Mohan