How To Fix W8728 - Key already exists for change document object &

W8728 - Overview

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 728

• Message text: Key already exists for change document object &

What causes this issue?

A structure should be created for the change document object which
corresponds to the key of a business object type.
There is already a structure for the change document object that makes
the change document object compatible with a business object type.

How to fix this error?

Only overwrite the existing structure if the link between the change
document object and the other business object type is no longer needed.
If the existing link remains, you must allocate the event a different
business object type. This business object type must have a key
structure identical to the change object type or a key structure
identical to the structure defined.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W8728 - Key already exists for change document object & ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W8728 Key already exists for change document object &
  
  
  Cause:
  This warning message occurs when you try to create or register a change document object with a key that already exists in the system. In SAP, change document objects are used to track changes to specific business objects or database tables. Each change document object must have a unique key.
  The message indicates that the key you are trying to use for a new change document object is already assigned to an existing object. This typically happens during:
  
  Custom development or configuration when defining new change document objects.
  Transporting change document objects between systems.
  Manual attempts to create or modify change document objects in the system.
  
  
  Explanation:
  
  Change document objects are defined in table CDHDR and CDPOS.
  The key (object name) must be unique to avoid conflicts in change tracking.
  If the key already exists, SAP prevents duplication to