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