How To Fix RTCMMD203 - Material assignment & cannot be defined as the main assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: RTCMMD - Article Hierarchy

• Message number: 203

• Message text: Material assignment & cannot be defined as the main assignment

What causes this issue?

You can only define an existing secondary assignment as a main
assignment if the following conditions are met:
Valid to = 31.12.9999
Valid from <= today's date
Scheduling without gaps

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?

Select a valid assignment that has a valid to date of "infinite".

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 RTCMMD203 - Material assignment & cannot be defined as the main assignment ?

  The SAP error message RTCMMD203 typically occurs in the context of material management and is related to the assignment of materials in the system. This error indicates that a material cannot be defined as the main assignment due to certain constraints or conditions not being met.
  Cause:
  
  Material Status: The material may have a status that prevents it from being assigned as the main assignment. For example, it could be blocked for procurement or sales.
  Configuration Issues: There may be configuration settings in the system that restrict the assignment of certain materials as main assignments.
  Missing Data: Required data for the material may be missing or incomplete, such as master data or classification data.
  Hierarchy Issues: The material might be part of a hierarchy where it cannot be the main assignment due to its position in that hierarchy.
  Business Rules: There may be specific business rules or validations in place that prevent certain materials from being assigned as main.
  
  Solution:
  
  Check Material Status: Review the status of the material in the material master. Ensure that it is not blocked for any relevant processes (e.g., procurement, sales).
  Review Configuration: Check the configuration settings in the system related to material assignments. Ensure that the settings allow for the material to be assigned as the main assignment.
  Complete Missing Data: Ensure that all required data for the material is complete and accurate. This includes checking the material master data and any related classification data.
  Hierarchy Review: If the material is part of a hierarchy, review the hierarchy structure to ensure that the material can be assigned as the main assignment.
  Consult Business Rules: Review any business rules or validations that may be in place. If necessary, consult with your SAP functional team or business process owners to understand the constraints.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like MM03 (Display Material), MM02 (Change Material), or MM01 (Create Material) to check or modify material data.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Documentation: Refer to SAP documentation or help files for more detailed information on material assignments and related processes.
  Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to identify the cause of the RTCMMD203 error and implement the necessary solutions to resolve it.