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

M8_2131 - Overview

• 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