How To Fix CM_SUB_DATA021 - Value assignment type &1 allows only one instance; no authoriz. for this

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_SUB_DATA - Substance Data (Header, ID, Reference, Materials)

• Message number: 021

• Message text: Value assignment type &1 allows only one instance; no authoriz. for this

What causes this issue?

In Customizing, it is defined that the value assignment type &v1& can
only have one instance. An instance exists, but you do not have
authorization for it.

System Response

The value assignment type cannot be displayed.

How to fix this error?

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

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 CM_SUB_DATA021 - Value assignment type &1 allows only one instance; no authoriz. for this ?

  The SAP error message CM_SUB_DATA021 indicates that there is an issue with the value assignment type in the context of a specific object or transaction. This error typically arises when a value assignment type is configured to allow only one instance, but the system is trying to create or modify multiple instances, or the user does not have the necessary authorization to perform the action.
  Cause:
  
  Single Instance Restriction: The value assignment type specified (denoted as &1 in the error message) is configured to allow only one instance. This means that for the particular object or transaction, you cannot have multiple entries or instances of that value assignment type.
  Authorization Issues: The user attempting to perform the action may not have the necessary authorizations to create or modify the instance of the value assignment type.
  
  Solution:
  
  
  Check Configuration:
  
  Review the configuration of the value assignment type in the relevant customizing settings (usually found in the SAP IMG under the relevant module).
  Ensure that the value assignment type is set up correctly and that it is intended to allow only one instance. If multiple instances are required, consider changing the configuration.
  
  
  
  Review Existing Instances:
  
  Check if there is already an existing instance of the value assignment type. If so, you may need to modify or delete the existing instance before creating a new one.
  
  
  
  Authorization Check:
  
  Verify the user's authorizations. Ensure that the user has the necessary roles and permissions to perform the action related to the value assignment type.
  You can use transaction SU53 to check for authorization failures after the error occurs. This transaction will show you which authorization checks failed.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific details about the value assignment type and its configuration.
  
  
  
  Contact SAP Support:
  
  If the issue persists and you cannot determine the cause, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may need to use specific transaction codes to check configurations or authorizations (e.g., SPRO for configuration, SU01 for user management).
  SAP Notes: Search for relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  Community Forums: Consider checking SAP Community forums or other user groups for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution.