Solution needed for FIFO principle

Hi all,

Need your valuable inputs and workaround that can be done for the below requirement.

Valuation Method : FIFO

Item : Excisable

SAP BUSINESS ONE does not allow amendment to a po when transactions are been done.

1) I have made a purchase order (PO NO : 1) for ITEM A.

10 QTY FOR 5 RS

I have done all the transactions and outgoing payment has been done.

So now my inventory for item A is 10 qty.

Requirement:There is a change in price on the first PO and extra 2 rupees must be paid to the vendor in reference with the first po.

PO amendment is not possible in the first po and i am not ready to go with credit note due to few constraints at company level.

I have raised a PO for the same item with 0.0001 qty included the additional 2 rupees on the document level

and made a udf as amendment 1 in reference to PO 1.

I have followed the rest all transactions normally.

Now my inventory for item A is 10.0001 QTY

Is there any possibility to knock off exactly that 0.0001 qty from my inventory.

Note: Valuation Method is FIFO.

Thanks in advance.

Regards

Dinesh.S