How To Fix M8420 - Order price quantity leads to incorrect PO history

M8420 - Overview

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 420

• Message text: Order price quantity leads to incorrect PO history

What causes this issue?

The invoice references a PO item in which the PO unit of measure
differs from the PO price unit of measure. When the invoice is posted,
the following inconsistency arises in the PO history:
The difference between the total quantity invoiced and the total
quantity delivered had a different sign in the PO unit of measure and
in the PO price UoM. This means that there was a delivery surplus in
the unit of measure, and an invoice surplus in the other. This way we
can avoid having to enter further goods receipts that will not be
valuated.

System Response

The system does not allow you to post the invoice.

The PO price quantity must be at least &V2& &V3&.

The PO price quantity must be at most &V2& &V3&.

How to fix this error?

Check the quantity and the PO price quantity and make changes where
necessary.
If your entries are correct, then you need to analyze the PO history.
If there are already inconsistencies in the PO history, then you will
have to cancel any goods receipts and invoices containing the
incorrectly entered PO price quantity and then re-enter them. If this
is not possible, then you can correct the PO history by posting an
invoice with a PO price quantity

of at least &V2& &V3&

of at most &V2& &V3&

and then performing a cancellation.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M8420 - Order price quantity leads to incorrect PO history ?

  The SAP error message M8420 ("Order price quantity leads to incorrect PO history") typically occurs in the context of purchasing and inventory management when there is a discrepancy between the order price and the quantity in a purchase order (PO). This can lead to inconsistencies in the PO history and affect financial reporting and inventory valuation.
  Causes:
  
  Price Changes: If the price of an item has changed after the purchase order was created, and the new price is not reflected in the PO, it can lead to discrepancies.
  Quantity Adjustments: If the quantity of items received or invoiced does not match the quantity ordered, it can cause issues in the PO history.
  Manual Adjustments: Manual changes to the PO or related documents that do not follow the standard process can lead to inconsistencies.
  Incomplete or Incorrect Data Entry: Errors during data entry when creating or modifying purchase orders can lead to this error.
  
  Configuration Issues: Incorrect