How To Fix M8_2128 - Differential invoicing: external document number not available

M8_2128 - Overview

• Message type: E = Error

• Message class: M8_2 - Logistics Invoice Verification

• Message number: 128

• Message text: Differential invoicing: external document number not available

What causes this issue?

You have defined checks for external document numbers in Customizing.
However, there is no external document number in the credit item of the
IDoc or SOA message.

System Response

The document was not posted.

How to fix this error?

Either deactivate the external document number 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 enter the external document number
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_2128 - Differential invoicing: external document number not available ?

  The SAP error message M8_2128, which states "Differential invoicing: external document number not available," typically occurs in the context of differential invoicing in SAP. This error indicates that the system is unable to find the external document number that is required for processing the differential invoice.
  
  Cause:
  
  Missing External Document Number: The external document number that is supposed to be linked to the differential invoice is not available in the system.
  Incorrect Configuration: There may be configuration issues in the invoicing or document management settings that prevent the system from recognizing the external document number.
  Data Entry Errors: The external document number may have been entered incorrectly or may not exist in the system.
  Document Deletion: The document that the differential invoice is referencing may have been deleted or archived, making it unavailable for processing.
  
  
  Solution:
  
  Check External Document Number: Verify that the external document number is correctly entered and exists in the system. You can do