How To Fix MM176 - User names can be kept only with a processing block size of 1

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 176

• Message text: User names can be kept only with a processing block size of 1

What causes this issue?

For technical reasons, the names of the users, who made the scheduled
changes, can be copied to the change documents only with a
<DS:DE.MG_BLOCK>processing block size</> of <LS>1</>.

System Response

The system has set the processing block size to <LS>1</>. However, this
can slow down the system considerably.

How to fix this error?

Decide whether you prefer to carry out this function more swiftly with
a higher processing block size, or whether you want to see the original
user names.

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 MM176 - User names can be kept only with a processing block size of 1 ?

  The SAP error message MM176 ("User names can be kept only with a processing block size of 1") typically occurs in the context of material master data processing, particularly when dealing with user-specific data or settings. This error indicates that the system is trying to process user names in a way that is incompatible with the current block size setting.
  Cause:
  The error is usually caused by the following factors:
  
  Block Size Configuration: The processing block size for user names is set to a value greater than 1, which is not allowed for user-specific data.
  Data Processing Logic: The logic in the program or transaction being executed may be attempting to handle user names in a batch process rather than individually.
  Custom Code or Enhancements: If there are custom developments or enhancements in the system that manipulate user data, they may not adhere to the required processing rules.
  
  Solution:
  To resolve the MM176 error, you can take the following steps:
  
  
  Check Block Size Configuration:
  
  Go to the relevant configuration settings in SAP and ensure that the block size for user names is set to 1. This is typically found in the material master configuration or user settings.
  
  
  
  Review Custom Code:
  
  If there are any custom programs or enhancements that deal with user names, review the code to ensure that it processes user names individually rather than in batches.
  
  
  
  Use Standard Transactions:
  
  If you are using a custom transaction or program, try using the standard SAP transaction for the task you are performing. This can help determine if the issue is with the custom code.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates that resolve the issue.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP Support for further assistance. Provide them with details about the error, including the transaction code and any relevant logs.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes related to material master data, such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material).
  User Management: Understand how user management works in SAP, including user roles and authorizations, as these can impact how user-specific data is processed.
  SAP Documentation: Refer to SAP Help documentation for detailed information on material master data processing and user management.
  
  By following these steps, you should be able to identify and resolve the cause of the MM176 error in your SAP system.