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

SAP Error Message - Details

• 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 settings in the SAP system related to pricing or purchasing can also lead to this error.
  
  Solutions:
  
  Review Purchase Order: Check the purchase order for any discrepancies in price and quantity. Ensure that the order reflects the correct values.
  Adjust Prices and Quantities: If there are discrepancies, adjust the prices and quantities in the purchase order to match the actual values.
  Check PO History: Review the PO history to identify any inconsistencies. This can help in understanding where the error originated.
  Use Transaction Codes: Utilize transaction codes like ME23N (Display Purchase Order) to review the details of the PO and ME22N (Change Purchase Order) to make necessary adjustments.
  Consult with Finance: If the issue is related to financial reporting, consult with the finance team to ensure that all entries are correct and consistent.
  System Configuration: If the issue persists, check the configuration settings in the SAP system related to purchasing and pricing. This may require assistance from an SAP consultant or system administrator.
  Training and Documentation: Ensure that users involved in the purchasing process are adequately trained and that there is proper documentation to minimize manual errors.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its system with fixes and improvements.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME21N (Create Purchase Order), ME22N (Change Purchase Order), and ME23N (Display Purchase Order) for managing purchase orders.
  User Roles: Ensure that users have the appropriate roles and permissions to make changes to purchase orders and related documents.
  Testing: After making adjustments, conduct tests to ensure that the changes resolve the error and do not introduce new issues.
  
  If the problem persists after following these steps, it may be necessary to escalate the issue to your SAP support team or consult with an SAP expert for further investigation.