How To Fix VMP_MSG161 - Action cannot be performed; assembly header has same material

SAP Error Message - Details

• Message type: E = Error

• Message class: VMP_MSG - VMP Message Manager

• Message number: 161

• Message text: Action cannot be performed; assembly header has same material

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 VMP_MSG161 - Action cannot be performed; assembly header has same material ?

  The SAP error message VMP_MSG161 indicates that an action cannot be performed because the assembly header has the same material. This typically occurs in the context of production planning or assembly processes where the system is trying to create or modify a production order or assembly that involves materials that are not allowed to be duplicated in the same context.
  Cause:
  The error is usually caused by one of the following reasons:
  
  Duplicate Material Assignment: The assembly header is trying to reference the same material multiple times, which is not allowed in the context of the operation being performed.
  Configuration Issues: There may be configuration settings in the material master or production order that prevent the same material from being used in the same assembly.
  Data Integrity Issues: There could be inconsistencies in the data that lead to the system interpreting the same material as being assigned multiple times.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Assembly Header: Review the assembly header to ensure that the same material is not being assigned multiple times. If it is, remove the duplicate entry.
  
  
  Review Material Assignment: Ensure that the materials assigned to the assembly are unique and do not conflict with the system's rules regarding material usage.
  
  
  Check Configuration: Verify the configuration settings in the material master and production order settings to ensure that they allow for the intended use of materials.
  
  
  Data Consistency Check: Run data consistency checks to identify any discrepancies in the material assignments or production orders that may be causing the issue.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines related to the error message and the context in which it occurs.
  
  
  Contact Support: If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO01 (Create Production Order), CO02 (Change Production Order), and CO03 (Display Production Order) to navigate through the production order processes.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address the issue.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.