How To Fix SD_CDS_PROJECTION016 - Usage of field &1 in on-condition of association &2 is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_PROJECTION - Message for Projection Entities

• Message number: 016

• Message text: Usage of field &1 in on-condition of association &2 is not allowed

What causes this issue?

In the definition of local association on-conditions in CDS Projection
Views, only fields from the underlying CDS View are supported.
Functions, virtual elements or path fields are not supported as operand
in the on-condition of association &V2&.

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?

Please use only fields from your underlying CDS View.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.