How To Fix IM160 - Changing the reference object not allowed since object list exists

SAP Error Message - Details

• Message type: E = Error

• Message class: IM - Maintenance notifications

• Message number: 160

• Message text: Changing the reference object not allowed since object list exists

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message IM160 - Changing the reference object not allowed since object list exists ?

  The SAP error message IM160, which states "Changing the reference object not allowed since object list exists," typically occurs in the context of managing maintenance plans or maintenance items in SAP PM (Plant Maintenance). This error indicates that you are trying to change a reference object (like a maintenance plan or item) that is currently linked to an object list, which prevents modifications.
  Cause:
  The primary cause of this error is that the reference object you are trying to change is associated with an object list that has already been created. In SAP PM, an object list is a collection of maintenance items or tasks that are linked to a specific maintenance plan or order. When an object list exists, the system restricts changes to the reference object to maintain data integrity.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Object List: Verify if there is indeed an object list associated with the reference object you are trying to change. You can do this by navigating to the relevant maintenance plan or item and checking its details.
  
  
  Remove Object List: If you need to change the reference object, you may need to remove the associated object list first. This can typically be done by:
  
  Navigating to the maintenance plan or item.
  Accessing the object list section.
  Deleting or disassociating the object list.
  
  
  
  Change Reference Object: Once the object list is removed, you should be able to change the reference object without encountering the error.
  
  
  Recreate Object List: If necessary, after making the changes to the reference object, you can recreate the object list as needed.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as IP01 (Create Maintenance Plan), IP02 (Change Maintenance Plan), and IP03 (Display Maintenance Plan) to manage maintenance plans effectively.
  Documentation: Refer to SAP documentation or help files for detailed instructions on managing maintenance plans and object lists.
  User Permissions: Ensure that you have the necessary permissions to make changes to maintenance plans and object lists, as restrictions may also lead to errors.
  Consult SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address specific issues.
  
  If the problem persists after following these steps, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.