How To Fix /SAPAPO/LTTYPE028 - Resource &1 is not a calendar resource

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/LTTYPE -

• Message number: 028

• Message text: Resource &1 is not a calendar resource

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/LTTYPE028 - Resource &1 is not a calendar resource ?

  The SAP error message /SAPAPO/LTTYPE028 Resource &1 is not a calendar resource typically occurs in the context of SAP Advanced Planning and Optimization (APO) when there is an issue related to resource configuration. This error indicates that the specified resource (denoted by &1) is not defined as a calendar resource in the system.
  Cause:
  
  Resource Configuration: The resource you are trying to use in your planning or scheduling process is not set up as a calendar resource in the system. Calendar resources are typically used to define working times, shifts, and availability.
  Incorrect Resource Type: The resource may be defined as a different type (e.g., production resource, transportation resource) that does not support calendar functionality.
  Missing Calendar Assignment: The resource may not have an associated calendar defined, which is necessary for scheduling and planning activities.
  
  Solution:
  
  
  Check Resource Definition:
  
  Go to the resource master data in SAP APO (transaction code /SAPAPO/RRP3 or similar).
  Verify that the resource in question is correctly defined and check its type.
  
  
  
  Assign Calendar:
  
  If the resource is not defined as a calendar resource, you may need to create or modify the resource to ensure it is set up as a calendar resource.
  Assign a calendar to the resource that defines its working hours and availability.
  
  
  
  Modify Resource Type:
  
  If the resource is incorrectly classified, you may need to change its type to a calendar resource. This may involve creating a new resource with the correct type and transferring any relevant data.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for guidance on setting up calendar resources and the specific requirements for your version of SAP APO.
  
  
  
  Testing:
  
  After making the necessary changes, test the resource in the planning or scheduling process to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for resource management in SAP APO, such as /SAPAPO/RRP3 for resource planning and /SAPAPO/RES01 for resource overview.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Roles: Ensure that you have the necessary authorizations to modify resource settings in the system.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a technical consultant who specializes in SAP APO for further assistance.