How To Fix SAPLWSII031 - External invoice number &1 does not belong to incoming invoice &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SAPLWSII - SAP Retail Store: Incoming Invoice

• Message number: 031

• Message text: External invoice number &1 does not belong to incoming invoice &2

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAPLWSII031 - External invoice number &1 does not belong to incoming invoice &2 ?

  The SAP error message SAPLWSII031 indicates that there is a mismatch between the external invoice number and the incoming invoice number in the system. This typically occurs during the processing of invoices, particularly in scenarios involving invoice verification or integration with external systems.
  Cause:
  
  
  Mismatch of Invoice Numbers: The external invoice number provided does not correspond to the incoming invoice number in the system. This could happen due to:
  
  Manual entry errors.
  Incorrect data being sent from an external system.
  Invoices being processed in the wrong sequence.
  Duplicate invoice entries.
  
  
  
  Data Synchronization Issues: If the external system and SAP are not properly synchronized, it may lead to discrepancies in invoice numbers.
  
  
  Configuration Issues: There may be configuration settings in the SAP system that are not aligned with the external system's invoice processing.
  
  
  Solution:
  
  
  Verify Invoice Numbers: Check the external invoice number and the incoming invoice number for accuracy. Ensure that they match and are correctly entered.
  
  
  Check Data Flow: If the invoice is being processed from an external system, verify that the data being sent is correct and that the external system is functioning properly.
  
  
  Review Integration Settings: If you are using middleware or integration tools (like SAP PI/PO), ensure that the mappings and configurations are set up correctly to handle invoice data.
  
  
  Consult Logs: Look at the application logs or error logs in SAP to get more details about the error. This can provide insights into what went wrong during the processing.
  
  
  Reprocess the Invoice: If the error was due to a temporary issue, you may try to reprocess the invoice after correcting any discrepancies.
  
  
  Contact Support: If the issue persists, consider reaching out to your SAP support team or consulting SAP documentation for further troubleshooting steps.
  
  
  Related Information:
  
  Transaction Codes: You may want to check relevant transaction codes such as MIRO (Invoice Verification) or FB60 (Enter Incoming Invoice) to see if the invoice can be processed correctly.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide specific fixes or patches.
  Documentation: Review SAP documentation on invoice processing and integration with external systems for best practices and troubleshooting tips.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.