How To Fix CM_SUB_DATA030 - Specification already inherits data; no reference assignment is possible

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 030

• Message text: Specification already inherits data; no reference assignment is possible

What causes this issue?

The specification already occurs as a target specification in an
inheritance relationship. You cannot therefore assign reference
specifications to this specification.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM_SUB_DATA030 - Specification already inherits data; no reference assignment is possible ?

  The SAP error message CM_SUB_DATA030 indicates that a specification already inherits data, and therefore, a reference assignment is not possible. This typically occurs in the context of SAP's Classification Management or Material Management modules, where specifications are used to define characteristics and values for materials or products.
  Cause:
  
  Inheritance of Data: The specification you are trying to assign a reference to already has inherited data from another specification. In SAP, when a specification inherits data, it means that it is already linked to another specification, and thus, it cannot accept another reference assignment.
  Incorrect Configuration: There may be a configuration issue where the specifications are not set up correctly, leading to conflicts in data inheritance.
  Data Integrity Rules: SAP has built-in data integrity rules that prevent multiple references to be assigned to a specification that already has inherited data.
  
  Solution:
  
  Check Inheritance: Review the specifications involved to see if the one you are trying to assign a reference to already inherits data from another specification. You can do this by navigating to the specification in question and checking its properties.
  Remove Inheritance: If it is appropriate for your business process, you may consider removing the inheritance from the specification. This can be done in the specification management area, but be cautious as this may affect other linked specifications.
  Create a New Specification: If the existing specification cannot be modified, consider creating a new specification that does not inherit data and assign the reference to this new specification.
  Consult Documentation: Refer to SAP documentation or help resources for specific steps on managing specifications and data inheritance.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as C202 (Create Specification) or C203 (Change Specification) to manage specifications effectively.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that could resolve the issue.
  User Roles and Permissions: Ensure that you have the necessary permissions to modify specifications and their inheritance settings.
  
  By following these steps, you should be able to address the CM_SUB_DATA030 error and manage your specifications effectively in SAP.