How To Fix SD_CDS_PROJECTION017 - Field selection of association &1 is not supported in Projection Views

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_PROJECTION - Message for Projection Entities

• Message number: 017

• Message text: Field selection of association &1 is not supported in Projection Views

What causes this issue?

Selection of fields from associations, which are defined in CDS
Projection Views, is not supported.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SD_CDS_PROJECTION017 - Field selection of association &1 is not supported in Projection Views ?

  The SAP error message SD_CDS_PROJECTION017 indicates that there is an issue with the field selection of an association in a projection view within the Core Data Services (CDS) framework. This error typically arises when you attempt to select fields from an association that is not supported in the context of a projection view.
  Cause:
  The error occurs due to the following reasons:
  
  Field Selection from Associations: In projection views, you can only select fields from the main entity and not from associated entities. If you try to include fields from an associated entity, the system will raise this error.
  Incorrect CDS View Definition: The projection view may be incorrectly defined, where fields from an association are being referenced directly.
  Incompatibility with Projection Views: Certain associations may not be compatible with projection views due to the way they are structured or defined.
  
  Solution:
  To resolve the SD_CDS_PROJECTION017 error, you can take the following steps:
  
  
  Review the CDS View Definition:
  
  Check the definition of your projection view and ensure that you are only selecting fields from the main entity.
  Remove any fields that are being selected from associated entities.
  
  
  
  Use Join Instead of Association:
  
  If you need to access fields from an associated entity, consider using a join instead of an association in your CDS view. This allows you to include fields from related tables without triggering the error.
  
  
  
  Modify the Projection View:
  
  If you need to keep the association, you may need to create a different type of CDS view (e.g., a basic view or a consumption view) that allows for the selection of fields from associated entities.
  
  
  
  Check Documentation:
  
  Refer to the SAP documentation for Core Data Services to understand the limitations and best practices for defining projection views.
  
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Projection views are a specific type of CDS view that allows for the selection of a subset of fields from a data source.
  Associations: In CDS, associations define relationships between entities. They are used to navigate between related data but have limitations in projection views.
  SAP Notes and Community: Check SAP Notes or the SAP Community for any updates or similar issues reported by other users. This can provide additional insights or workarounds.
  
  By following these steps, you should be able to resolve the error and successfully define your projection view without issues.