How To Fix CM_SUB_DATA020 - Value assignment type &1 allows one instance; instance exists in the past

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 020

• Message text: Value assignment type &1 allows one instance; instance exists in the past

What causes this issue?

In Customizing, it was specified that the value assignment type &v1& can
only have one <DS:GLOS.3621B3A9B2CE569BE10000009B38F9B7>value assignment
instance</>. No valid value assignment instance exists for the key date,
but there is one in the past.

System Response

The value assignment instance cannot be displayed.

How to fix this error?

If you need to create a value assignment instance, you can either:
Delete the instances that are valid in the past
Create the new instance with a change number whose validity period is
after the date &V3&

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM_SUB_DATA020 - Value assignment type &1 allows one instance; instance exists in the past ?

  The SAP error message CM_SUB_DATA020 indicates that there is an issue with the value assignment type in the context of a characteristic or a class. Specifically, it means that the value assignment type allows only one instance, but there is already an existing instance that is valid in the past. This typically occurs in the context of classification or variant configuration where a characteristic is defined to allow only a single value assignment.
  Cause:
  
  Single Instance Limitation: The value assignment type is configured to allow only one instance, but there is already an instance that was created in the past.
  Time Dependency: The existing instance may have a validity period that overlaps with the current date or the date you are trying to create a new instance.
  Incorrect Data Entry: There may be an attempt to assign a new value to a characteristic that already has a value assigned.
  
  Solution:
  
  Check Existing Instances: Review the existing instances of the value assignment type to see if there is already an instance that is valid. You can do this by navigating to the relevant characteristic or class in the SAP system.
  Modify or Delete Existing Instance: If the existing instance is no longer needed, you can delete it or modify its validity period to allow for the new instance to be created.
  Adjust Validity Dates: If the existing instance is valid for a specific period, consider adjusting the validity dates of the new instance you are trying to create to avoid overlap.
  Consult Configuration: If you are unsure about the configuration of the value assignment type, consult with your SAP configuration team to ensure that the settings align with your business requirements.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like CL02 (Change Class), CL03 (Display Class), or CT04 (Change Characteristic) to manage characteristics and classes.
  Documentation: Review SAP documentation related to classification and variant configuration for more details on how value assignment types work.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues or provide additional guidance on handling this error message.
  
  If the problem persists after trying the above solutions, it may be beneficial to engage with your SAP support team or consult SAP community forums for further assistance.