Wrongly update item cost & quantity in GRN PO & A/P Invoice.How to reverse?

Question

Dear all experts,
I need some advise from you guy & girl..
I have a scenario as below:
My Supplier name Sia Food
Actual Invoice detail is Fishball 100 KG.  (1Kg=2pkt=RM 8)
1) When GRPO issue: i keyed 200 pkt with price RM 3.80. Thus
(Dr Finish Goods    RM760, Cr Goods Received not Invoiced RM760)
2) When AP Invoice: I copy from GRPO however have take only 100 pkt with unit price RM 8.00. Thus
(Dr Goods Received not Invoiced RM380  &  Finish Goods RM420,  Cr Supplier RM800) create in system.
I suppose to update 100 pkt with price rm4 dollar. However, the user had accidently match the invoice total from supplier without checking proper the quantity. The reason is the Invoice 200pkt  with rm8 is come from two GRN PO.
Question:
How can i reverse or contra the allocation account or clearing account & adjust the item cost? Any best idea?
I'm thinking to close the GRN PO, the entry will created as below:
CR   Goods Received not Invoiced RM  760, DR Stock Clearing Account 760)
When i revalue the item cost back to RM8, the account cannot contra with the allocation & stock clearing account. The reason is the some of the stock had been release to customer.
Any better idea?
Regards,
Eric Tan
Edited by: Paul Finneran on Apr 15, 2009 12:21 PM

Answer 1

Hai Eric Tan Yan Liang
                        In your case Supplier credited correct amount if am correct, now
Goods Received not Invoiced is not nullify bcz excess amount in Invoice, so put JE for adjust this
for  short quantity put "goods receipt in inventory module" with correct value,if u have old stock issue
that old stock after that put GoodsReceipt choosing appropriate account code,please correct me if am wrong