How To Fix OL654 - Key changes not allowed in subtypes

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 654

• Message text: Key changes not allowed in subtypes

What causes this issue?

You tried to change the definition of the key fields of a derived type
(create new key field, redefine existing key field, rename / delete
inherited key field).
Subtypes are specializations of the supertype and can therefore appear
at any time in the role of the supertype. For this reason, changes to
key field definitions are not permitted.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL654 - Key changes not allowed in subtypes ?

  The SAP error message OL654 ("Key changes not allowed in subtypes") typically occurs when you are trying to change the key fields of a subtype in a hierarchical data structure, such as when working with object types in the SAP Business Workflow or when dealing with certain data models in SAP.
  Cause:
  
  Key Field Change: The error arises when you attempt to change the key fields of a subtype that is derived from a supertype. In SAP, subtypes inherit characteristics from their supertype, and changing the key fields of a subtype can lead to inconsistencies in the data model.
  Data Integrity: SAP enforces data integrity rules to ensure that the relationships and hierarchies between supertype and subtype are maintained. Changing key fields could violate these relationships.
  
  Solution:
  
  Avoid Key Changes: The simplest solution is to avoid changing the key fields of the subtype. If you need to change the key, consider creating a new subtype or modifying the supertype instead.
  Review Data Model: Analyze the data model to understand the relationships between the supertype and subtype. Ensure that any changes you want to make are permissible within the structure.
  Use Alternative Approaches: If you need to modify the data associated with the subtype, consider using other methods such as updating attributes or adding new fields rather than changing the key fields.
  Consult Documentation: Refer to SAP documentation or consult with your SAP administrator or functional consultant for guidance on how to handle the specific scenario you are facing.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to this error message. SAP frequently updates its knowledge base with solutions and workarounds for common issues.
  Transaction Codes: Familiarize yourself with relevant transaction codes that may help you analyze or modify the data model, such as SE11 (Data Dictionary) or SE80 (Object Navigator).
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  If you continue to face challenges, it may be beneficial to reach out to SAP support for more tailored assistance based on your specific system configuration and requirements.