Net amount doubled when goods issue is posted

Question

Hi guys,
A material was received against a PO. Issued to customer,customer found defect and returned .  It was then returned to the vendor who corrected it and then forwarded back to us and received in. and is again issued to customer . Everything has gone fine but in the last transaction(mvt type 601), the amount posted is double the material amount.  I have checked the price in the material master ,the moving average price got changed to double it's price. what might have caused this. price change? Is it related to a credit memo( i'm new to this). I've checked sales order. and the price is double for the item in there too.
I'd appreciate your help.
Thanks
Cheris T

Answer 1

Hi steve,
our process here is:
1) we received goods ( 101)
2) invoice verification is done
3) issued to customer.(601)
4) customer returned ( 651 and then 457)
5) we did 122 against first goods receipt.
6) we did subsequent delivery for receiving the material against the PO
7) then they looked at mr11 they've seen some GR/IR clearing against the same PO we used for the 101.they  posted the GR/IR clearing .
{I think something is wrong in the return to vendor process here: 101>>122>>101)}
8)we created a new lin item in the same sales order we used for first delivery and issued the item.
((here occured the problem .the sales order item picked the price from material master which is now double it's price))
Can you help me findout what might have been the problem here
I have checked the PO (same for both goods receipts) and the price is correct here.
I'd really appreciate your help.
Thanks
Cheris T