How To Fix M8_2131 - Differential invoicing: invalid unit of measure

SAP Error Message - Details

• Message type: E = Error

• Message class: M8_2 - Logistics Invoice Verification

• Message number: 131

• Message text: Differential invoicing: invalid unit of measure

What causes this issue?

You have activated the check for the credit memo quantity in
Customizing. The unit of measure referenced in the credit memo item of
the IDoc or the SOA message (&V1&) does not match the unit of measure
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 quantity 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 unit of measure
required 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_2131 - Differential invoicing: invalid unit of measure ?

  The SAP error message M8_2131, which states "Differential invoicing: invalid unit of measure," typically occurs in the context of differential invoicing in the Materials Management (MM) module. This error indicates that there is an issue with the unit of measure (UoM) being used in the differential invoice process.
  Cause:
  
  Invalid Unit of Measure: The unit of measure specified in the invoice does not match the expected unit of measure for the material or service being invoiced.
  Configuration Issues: There may be configuration issues in the material master or in the invoicing settings that lead to the system not recognizing the unit of measure.
  Data Inconsistencies: There could be inconsistencies in the data between the purchase order, goods receipt, and the invoice.
  Missing UoM in Master Data: The unit of measure may not be defined in the material master for the specific material.
  
  Solution:
  
  Check the Unit of Measure: Verify that the unit of measure used in the invoice matches the unit of measure defined in the material master. You can do this by checking the material master data (transaction code MM03).
  Review Configuration: Ensure that the configuration for differential invoicing is set up correctly. This includes checking the settings in the relevant customizing transactions (e.g., OMR6 for differential invoicing).
  Correct Data Inconsistencies: Ensure that the purchase order, goods receipt, and invoice all use the same unit of measure. If there are discrepancies, you may need to adjust the documents accordingly.
  Update Material Master: If the unit of measure is missing or incorrect in the material master, update it using transaction code MM02.
  Consult Documentation: Review SAP documentation or help files related to differential invoicing and unit of measure settings for further guidance.
  
  Related Information:
  
  Transaction Codes: 
  
  MM03: Display Material Master
  MM02: Change Material Master
  OMR6: Configuration for Differential Invoicing
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error.
  User Forums: Consider visiting SAP community forums or user groups for discussions related to this error, as other users may have encountered and resolved similar issues.
  
  If the problem persists 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.