How To Fix MMRP01079 - Matrix type cannot be changed (internal error)

SAP Error Message - Details

• Message type: E = Error

• Message class: MMRP01 - Rapid Planning Matrix

• Message number: 079

• Message text: Matrix type cannot be changed (internal error)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MMRP01079 - Matrix type cannot be changed (internal error) ?

  The SAP error message MMRP01079, which states "Matrix type cannot be changed (internal error)," typically occurs in the context of material master data management, particularly when dealing with matrix materials. This error indicates that there is an issue with changing the matrix type of a material that is already defined in the system.
  Cause:
  
  
  Matrix Material Configuration: The error often arises when there is an attempt to change the matrix type of a material that is already set up as a matrix material. Matrix materials are used to manage products that have multiple variations (like size, color, etc.) and changing the matrix type can lead to inconsistencies in the data structure.
  
  
  Data Integrity Issues: The system may have internal checks that prevent changes to the matrix type if there are existing dependencies or configurations that rely on the current matrix type.
  
  
  System Bugs or Limitations: Sometimes, this error can be triggered by bugs in the SAP system or limitations in the version you are using.
  
  
  Solution:
  
  
  Check Matrix Configuration: Review the current configuration of the matrix material. Ensure that you are not trying to change the matrix type in a way that conflicts with existing data.
  
  
  Use Correct Transaction Codes: Make sure you are using the appropriate transaction codes for managing matrix materials. For example, use MM01 for creating materials and MM02 for changing them.
  
  
  Consult Documentation: Refer to SAP documentation or help files for guidance on matrix materials and their configurations. This can provide insights into what changes are permissible.
  
  
  Data Consistency Check: Perform a data consistency check to ensure that there are no inconsistencies in the material master data that could be causing the error.
  
  
  Contact SAP Support: If the issue persists and you suspect it may be a bug or a limitation of your current SAP version, consider reaching out to SAP support for assistance. They may provide patches or workarounds.
  
  
  Review User Authorizations: Ensure that the user attempting to make the change has the necessary authorizations to modify matrix materials.
  
  
  Related Information:
  
  Matrix Materials: Understand the concept of matrix materials in SAP, which allows for the management of products with multiple attributes.
  Material Master Data: Familiarize yourself with the material master data structure and how matrix types are defined and used within SAP.
  SAP Notes: Check SAP Notes for any known issues related to MMRP01079, as there may be specific fixes or recommendations provided by SAP.
  
  By following these steps, you should be able to address the MMRP01079 error effectively.