How To Fix /SAPAPO/DMRES804 - Reference resource from resource &1 is unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/DMRES -

• Message number: 804

• Message text: Reference resource from resource &1 is unknown

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/DMRES804 - Reference resource from resource &1 is unknown ?

  The SAP error message /SAPAPO/DMRES804 indicates that there is an issue with a reference resource in the SAP Advanced Planning and Optimization (APO) module. Specifically, the message states that the reference resource from resource &1 is unknown. This typically occurs in the context of demand management or production planning when the system cannot find the specified resource.
  Cause:
  
  Resource Not Defined: The resource specified in the error message may not be defined in the system. This could happen if the resource was deleted or never created.
  Incorrect Configuration: There may be a configuration issue where the resource is not properly linked to the planning object or master data.
  Data Inconsistency: There could be inconsistencies in the master data, such as missing or incorrect entries in the resource master data.
  Transport Issues: If the system has recently undergone a transport of changes, the resource may not have been included or properly activated in the target system.
  
  Solution:
  
  Check Resource Definition: Verify that the resource specified in the error message exists in the system. You can do this by navigating to the resource master data in the SAP GUI (Transaction code: /SAPAPO/RRP3 or /SAPAPO/RES01).
  Review Configuration: Ensure that the resource is correctly configured and linked to the relevant planning objects. Check the settings in the APO system to confirm that the resource is active and correctly defined.
  Correct Master Data: If the resource is missing or incorrect, you may need to create or update the resource master data. Ensure that all necessary fields are filled out correctly.
  Check Transport Requests: If the issue arose after a transport, check the transport logs to ensure that all necessary objects were included and activated in the target system.
  Consult Documentation: Review SAP documentation or notes related to this error message for any specific recommendations or patches that may address the issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for managing resources in APO, such as /SAPAPO/RRP3 for planning board and /SAPAPO/RES01 for resource master data.
  SAP Notes: Search for SAP Notes related to this error message in the SAP Support Portal for any known issues or fixes.
  User Forums: Consider checking SAP community forums or discussion boards for similar issues faced by other users and their solutions.
  
  If the problem persists after following these steps, it may be beneficial to engage with your SAP support team or consult with an SAP expert for further assistance.