How To Fix SADL_GW_DT_CDS070 - The root of a composition cannot be of type '&'.

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_CDS - Messages CDS Checks

• Message number: 070

• Message text: The root of a composition cannot be of type '&'.

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_CDS070 - The root of a composition cannot be of type '&'. ?

  The SAP error message SADL_GW_DT_CDS070 typically occurs in the context of SAP Gateway and Core Data Services (CDS) when there is an issue with the data model definition, particularly when defining a composition in a CDS view. The error message indicates that the root of a composition cannot be of a certain type, which is represented by the placeholder '&'.
  Cause:
  This error usually arises due to one of the following reasons:
  
  
  Invalid Composition Definition: The root entity of a composition must be a valid entity type that can be composed. If the root entity is not a valid type or is incorrectly defined, this error will occur.
  
  
  Incorrect Annotations: The annotations used in the CDS view may not be correctly defined, leading to an invalid structure for the composition.
  
  
  Data Model Issues: There may be issues with the underlying data model, such as missing associations or incorrect relationships between entities.
  
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check the CDS View Definition:
  
  Review the CDS view where the error is occurring. Ensure that the root entity of the composition is correctly defined and is a valid entity type.
  Make sure that the entity type is not abstract and is properly annotated.
  
  
  
  Validate Annotations:
  
  Ensure that the annotations related to the composition are correctly defined. Check for any missing or incorrect annotations that could lead to this error.
  
  
  
  Review Associations:
  
  Check the associations defined in the CDS view. Ensure that they are correctly set up and that the relationships between entities are valid.
  
  
  
  Test with Simplified Model:
  
  If possible, simplify the model to isolate the issue. Start with a basic version of the CDS view and gradually add complexity to identify what triggers the error.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for CDS views and compositions to ensure that you are following the correct guidelines and best practices.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest patches and updates, as there may be bug fixes related to this issue.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to CDS views and the specific error message for any known issues or additional guidance.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have found.
  SAP Help Portal: Utilize the SAP Help Portal for detailed documentation on CDS views, annotations, and data modeling best practices.
  
  By following these steps, you should be able to identify and resolve the issue causing the SADL_GW_DT_CDS070 error in your SAP environment.