How To Fix RTCMMD142 - A main assignment exists for hierarchy level & and node &

SAP Error Message - Details

• Message type: E = Error

• Message class: RTCMMD - Article Hierarchy

• Message number: 142

• Message text: A main assignment exists for hierarchy level & and node &

What causes this issue?

In the standard configuration, only one main assignment can be assigned
for a material within a material hierarchy. If you want to be able to
define multiple main assignments for the material assignment, a main
assignment of the material assignment is possible below the node of the
current hierarchy level.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RTCMMD142 - A main assignment exists for hierarchy level & and node & ?

  The SAP error message RTCMMD142 indicates that there is a conflict in the assignment of a main assignment for a specific hierarchy level and node in the context of Master Data Management (MDM) or similar hierarchical structures in SAP. This error typically arises when you are trying to create or modify a hierarchy node that already has a main assignment defined.
  Cause:
  
  Existing Main Assignment: The hierarchy level and node you are trying to modify already have a main assignment associated with them.
  Hierarchy Structure: The structure of the hierarchy may not allow for multiple main assignments at the same level or node.
  Data Integrity Rules: SAP enforces data integrity rules that prevent the creation of conflicting assignments.
  
  Solution:
  To resolve the RTCMMD142 error, you can follow these steps:
  
  
  Check Existing Assignments:
  
  Navigate to the hierarchy structure in SAP and check the existing assignments for the specified level and node.
  Identify if there is already a main assignment present.
  
  
  
  Modify or Remove Existing Assignment:
  
  If a main assignment exists and you need to change it, you may need to remove the existing main assignment before creating a new one.
  Ensure that the hierarchy structure allows for the changes you are trying to make.
  
  
  
  Consult Documentation:
  
  Review the relevant SAP documentation or help files for guidance on managing hierarchy assignments and understanding the rules that apply to your specific scenario.
  
  
  
  Use Transaction Codes:
  
  Use relevant transaction codes (like RSCUSTV0, RSCUSTV1, etc.) to manage and view hierarchy assignments if applicable.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is a recurring issue or if it affects critical business processes.
  
  
  
  Related Information:
  
  Hierarchy Management: Understanding how hierarchies work in SAP is crucial. Familiarize yourself with the concepts of main assignments, sub-assignments, and the overall structure of the hierarchy.
  Data Consistency: Ensure that any changes you make maintain data consistency and integrity within the system.
  User Permissions: Verify that you have the necessary permissions to make changes to the hierarchy assignments.
  
  By following these steps, you should be able to identify the cause of the RTCMMD142 error and implement a solution to resolve it.