How To Fix M_012 - More than one possible matnr found for external in material mapping

SAP Error Message - Details

• Message type: E = Error

• Message class: M_ - Messages for material field length extension mapping

• Message number: 012

• Message text: More than one possible matnr found for external in material mapping

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message M_012 - More than one possible matnr found for external in material mapping ?

  The SAP error message M_012 ("More than one possible matnr found for external in material mapping") typically occurs during the process of material mapping, particularly when integrating external systems with SAP. This error indicates that the system has found multiple material numbers (MATNR) that correspond to a single external material identifier, leading to ambiguity in the mapping process.
  Cause:
  
  Duplicate Entries: There are multiple entries in the material mapping table for the same external material identifier.
  Incorrect Mapping: The mapping configuration may not be set up correctly, leading to multiple materials being associated with the same external identifier.
  Data Integrity Issues: There may be inconsistencies or errors in the data being imported or processed, causing the system to find multiple matches.
  
  Solution:
  
  
  Check Material Mapping Table: Review the material mapping table (usually in the relevant customizing transaction) to identify duplicate entries for the external material identifier. Ensure that each external identifier maps to a unique material number.
  
  
  Data Cleanup: If duplicates are found, clean up the data by removing or consolidating the duplicate entries. Ensure that each external material identifier has a single corresponding material number.
  
  
  Review Configuration: Check the configuration settings for material mapping in the relevant SAP module (e.g., MM, SD). Ensure that the mapping rules are correctly defined and that there are no conflicting settings.
  
  
  Data Validation: Validate the data being imported or processed to ensure that it adheres to the expected format and does not contain duplicates or inconsistencies.
  
  
  Testing: After making changes, perform tests to ensure that the error does not occur again. Monitor the system for any further issues related to material mapping.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like MM02 (Change Material), MM03 (Display Material), or SE11 (Data Dictionary) to investigate the material master data and mapping tables.
  SAP Notes: Check SAP Notes for any known issues or patches related to material mapping and the specific error message.
  Documentation: Refer to SAP documentation for material management and integration processes to understand best practices for material mapping.
  
  By following these steps, you should be able to resolve the M_012 error and ensure proper material mapping in your SAP system.