How To Fix /SAPAPO/DMRES128 - Dimension cannot be changed; resource is used as a reference resource

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/DMRES -

• Message number: 128

• Message text: Dimension cannot be changed; resource is used as a reference resource

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/DMRES128 - Dimension cannot be changed; resource is used as a reference resource ?

  The SAP error message /SAPAPO/DMRES128 indicates that a dimension cannot be changed because the resource in question is being used as a reference resource. This typically occurs in the context of SAP Advanced Planning and Optimization (APO), particularly when dealing with resource planning and configuration.
  Cause:
  
  Reference Resource Usage: The resource you are trying to modify is set as a reference resource for other resources. In SAP APO, reference resources are used to inherit certain characteristics or settings from a primary resource. If a resource is being referenced, its dimensions (like capacity, availability, etc.) cannot be altered directly.
  Data Integrity: The system prevents changes to ensure data integrity and consistency across the resources that depend on the reference resource.
  
  Solution:
  
  Identify Dependencies: First, identify which resources are using the resource as a reference. You can do this by checking the resource configuration in the SAP APO system.
  Change Reference Settings: If you need to change the dimensions of the resource, you may need to:
  
  Remove the reference relationship from the resource.
  Make the necessary changes to the dimensions.
  Re-establish the reference relationship if needed.
  
  
  Consult Documentation: Review the SAP documentation or help files related to resource management and reference resources for specific steps on how to manage these settings.
  Use Transaction Codes: Utilize relevant transaction codes (like /SAPAPO/RES01 for resource maintenance) to navigate to the resource settings and make the necessary adjustments.
  Check for Active Planning Runs: Ensure that there are no active planning runs that might be locking the resource configuration. If there are, you may need to wait until they are completed.
  
  Related Information:
  
  SAP Notes: Check for any SAP Notes related to this error message for additional guidance or patches that may address specific issues.
  Training and Documentation: Consider reviewing training materials or documentation on resource management in SAP APO to better understand how reference resources work and how to manage them effectively.
  Support: If the issue persists or if you are unsure about making changes, consider reaching out to your SAP support team or consulting with an SAP expert.
  
  By following these steps, you should be able to resolve the error and make the necessary changes to the resource dimensions.