How To Fix CDS_UNIT_MESSAGE026 - Unit testing of &1 is not possible.

SAP Error Message - Details

• Message type: E = Error

• Message class: CDS_UNIT_MESSAGE - Message Class

• Message number: 026

• Message text: Unit testing of &1 is not possible.

Since a test double already created for &V2& as part of &V3& testing of
&V4&. Choose another node in 'i_dependency_list' for the hierarchy
testing of &V4&.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CDS_UNIT_MESSAGE026 - Unit testing of &1 is not possible. ?

  The SAP error message CDS_UNIT_MESSAGE026 indicates that unit testing for a Core Data Services (CDS) view or entity is not possible. This error typically arises when there are issues with the configuration or definition of the CDS view that prevent it from being tested.
  Causes:
  
  Missing Annotations: The CDS view may lack the necessary annotations that are required for unit testing.
  Incompatible Data Model: The underlying data model may not support unit testing due to certain constraints or configurations.
  Syntax Errors: There may be syntax errors or issues in the CDS view definition that prevent it from being executed.
  Dependencies: The CDS view might depend on other views or entities that are not properly defined or are missing.
  Transport Issues: If the CDS view is part of a transport request, there may be issues with the transport that affect its availability for testing.
  
  Solutions:
  
  Check Annotations: Ensure that the CDS view has the necessary annotations for unit testing. For example, it should have the @Testable annotation.
  Review the Definition: Go through the CDS view definition to check for any syntax errors or issues. Use the ABAP Development Tools (ADT) in Eclipse to validate the syntax.
  Check Dependencies: Verify that all dependent views and entities are correctly defined and activated.
  Activate the View: Make sure that the CDS view is activated. If it is not activated, activate it and try running the unit test again.
  Review Transport Requests: If the CDS view is part of a transport request, ensure that the transport is correctly released and imported into the target system.
  Consult Documentation: Refer to the SAP documentation for any specific requirements or limitations related to unit testing of CDS views.
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP systems.
  Unit Testing in SAP: Unit testing in SAP allows developers to validate the functionality of their code or data models in isolation.
  SAP Notes: Check SAP Notes for any known issues or patches related to CDS unit testing.
  SAP Community: Engage with the SAP Community for insights and solutions from other developers who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance.