How To Fix WZ151 - Object key has changed

SAP Error Message - Details

• Message type: E = Error

• Message class: WZ - Workflow: Model objects

• Message number: 151

• Message text: Object key has changed

What causes this issue?

As a result of the method call, the key has changed from '&v1&' to
'&v2&'.

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?

No action required.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WZ151 - Object key has changed ?

  Certainly! Here's a detailed explanation of the SAP error message WZ151: Object key has changed:
  
  Error Message: WZ151 - Object key has changed
  
  Cause:
  This error typically occurs when you try to update or save an object (such as a document, master data record, or transaction) in SAP, but the key fields of the object have been changed during the process. In SAP, the key fields uniquely identify an object, and changing these keys is generally not allowed because it would mean you are trying to change the identity of the object rather than its attributes.
  Common scenarios causing this error:
  
  The user or a program attempts to modify the primary key fields of an object.
  The object was changed or updated by another user or process between the time it was read and the time you tried to save it.
  A custom enhancement or user exit incorrectly modifies key fields.
  Data inconsistencies or incorrect handling in BAPIs or function modules that update objects.
  
  
  Explanation:
  
  SAP objects (like material master, purchase order, etc.) have key fields that uniquely identify them.
  When you read an object, SAP stores the key values.
  When you try to save or update the object, SAP compares the current key values with the original ones.
  If the keys differ, SAP throws the error WZ151 because it assumes the object identity has changed, which is not allowed.
  
  
  Solution:
  
  
  Check for Key Field Changes:
  
  Review the data you are trying to save.
  Ensure that the key fields (e.g., document number, material number, vendor number) have not been altered.
  If you need to create a new object with different keys, use a create transaction instead of change.
  
  
  
  Check for Concurrent Changes:
  
  Verify if another user or process has changed the object after you read it.
  Refresh or re-read the object before making changes.
  
  
  
  Review Custom Code:
  
  If you have custom enhancements, user exits, or BAdIs, check if they modify key fields.
  Correct the code to avoid changing key fields.
  
  
  
  Use Correct BAPIs/Function Modules:
  
  When updating objects programmatically, use the appropriate BAPI or function module designed for changes.
  Do not change key fields; if you need a new object, create it instead.
  
  
  
  Debugging:
  
  If the error occurs in a custom program, debug to see where the key fields are changed.
  Check the internal tables or structures holding the object data.
  
  
  
  
  Related Information:
  
  SAP Notes: Search SAP Service Marketplace or SAP ONE Support Launchpad for notes related to WZ151 or the specific object you are working with.
  Transaction Codes: The error can appear in various transactions depending on the object (e.g., MM02 for material master, ME22N for purchase orders).
  BAPI Documentation: Review the documentation of BAPIs used for updating objects to understand which fields are keys and which can be changed.
  Locking Mechanism: Sometimes, this error can be related to SAP locking mechanisms where the object was changed by another user.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WZ151 - Object key has changed
  
  
  Cause
  Attempt to change the key fields of an SAP object or concurrent modification
  
  
  Solution
  Do not change key fields; refresh data before update; check custom code; use correct BAPI
  
  
  Related Info
  Check SAP Notes, debug custom code, verify locking and concurrency issues
  
  
  
  
  If you provide the specific transaction or object type where this error occurs, I can give more tailored advice.