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

RTCMMD203 - Overview

• 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