How To Fix M8_2129 - Differential invoicing: invalid credit amount

SAP Error Message - Details

• Message type: E = Error

• Message class: M8_2 - Logistics Invoice Verification

• Message number: 129

• Message text: Differential invoicing: invalid credit amount

What causes this issue?

You have activated the check for the credit memo amount in Customizing.
The invoice amount referenced in the credit memo item of the IDoc or the
SOA message (&V1&) does not match the amount known to the system from
the preceding invoice (&V2&).

System Response

The document was not posted.

How to fix this error?

Either deactivate the credit memo amount check for your partner in
Customizing for <LS>Materials Management</>, under <LS>Logistics Invoice
Verification</> -> <LS>EDI</> -> <DS:SIMG.OLMROMRY>Enter Program
Parameters</> or ask your supplier to correct the credit memo amount in
the credit memo item of the IDoc or SOA message.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M8_2129 - Differential invoicing: invalid credit amount ?

  The SAP error message M8_2129, which states "Differential invoicing: invalid credit amount," typically occurs in the context of differential invoicing in the materials management module. This error indicates that there is an issue with the credit amount being processed in a differential invoice.
  Cause:
  
  Invalid Credit Amount: The credit amount specified in the invoice does not match the expected values based on the original invoice or the conditions set in the system.
  Configuration Issues: There may be configuration settings in the pricing procedure or invoice verification that are not aligned with the expected values for differential invoicing.
  Data Entry Errors: Manual entry errors during the creation of the invoice can lead to discrepancies in the credit amount.
  Incomplete or Incorrect Master Data: Issues with material master data, vendor master data, or pricing conditions can also lead to this error.
  
  Solution:
  
  Check the Credit Amount: Verify the credit amount entered in the invoice against the original invoice. Ensure that it is correct and within the acceptable range.
  Review Configuration: Check the configuration settings for differential invoicing in the pricing procedure. Ensure that the conditions for credit amounts are correctly defined.
  Correct Data Entry: If the error is due to manual entry, correct the invoice by entering the appropriate credit amount.
  Master Data Review: Ensure that all relevant master data (material, vendor, pricing conditions) is accurate and up to date.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on differential invoicing and the associated credit amounts.
  Debugging: If the issue persists, consider debugging the process to identify any underlying issues in the logic that calculates the credit amount.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Transaction Codes: Familiarize yourself with transaction codes related to invoice processing, such as MIRO (Invoice Verification) and MR8M (Cancel Invoice Document).
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  Testing: After making corrections, perform testing in a development or quality assurance environment to ensure that the issue is resolved before applying changes in the production environment.
  
  If the problem continues after following these steps, it may be beneficial to consult with your SAP support team or a technical consultant who can provide more in-depth analysis and assistance.