How To Fix CDS_UNIT_MESSAGE001 - Data source '&1' has unknown type '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: CDS_UNIT_MESSAGE - Message Class

• Message number: 001

• Message text: Data source '&1' has unknown type '&2'

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CDS_UNIT_MESSAGE001 - Data source '&1' has unknown type '&2' ?

  The SAP error message CDS_UNIT_MESSAGE001 indicates that there is an issue with a Core Data Services (CDS) view or data source in your SAP system. Specifically, the message states that the data source specified (denoted by &1) has an unknown type (denoted by &2). This typically occurs when the system cannot recognize the data source type due to various reasons.
  Causes:
  
  Incorrect Data Source Definition: The data source may not be defined correctly in the system, or it may be referencing a type that is not recognized.
  Missing or Inactive Data Source: The data source might not exist in the system, or it could be inactive.
  Transport Issues: If the CDS view or data source was transported from another system, there may have been issues during the transport process that led to missing components.
  Version Compatibility: The data source type may not be compatible with the version of the SAP system you are using.
  Authorization Issues: The user may not have the necessary authorizations to access the data source.
  
  Solutions:
  
  Check Data Source Definition: Verify the definition of the data source in the ABAP Dictionary (transaction SE11) or the relevant CDS view. Ensure that it is correctly defined and active.
  Activate the Data Source: If the data source is inactive, activate it. You can do this in the relevant transaction (e.g., SE11 for database tables or SE80 for CDS views).
  Review Transport Logs: If the issue arose after a transport, check the transport logs for any errors or warnings that might indicate what went wrong.
  Check for Missing Components: Ensure that all components related to the data source are present in the system. This includes any associated tables, views, or other objects.
  Consult Documentation: Review the SAP documentation for the specific data source type to ensure that it is supported in your version of SAP.
  Authorization Check: Ensure that the user has the necessary authorizations to access the data source. You may need to consult with your security team to verify this.
  Debugging: If you have access to debugging tools, you can try to debug the CDS view or the program that is calling the data source to get more insights into the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the error message. You can search for the error message number or keywords in the SAP Support Portal.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found.
  Documentation: Review the official SAP documentation for Core Data Services and the specific data source types you are working with.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.