How To Fix SDDL_PARSER_MSG170 - $$projection is not supported in abstract entities

SDDL_PARSER_MSG170 - Overview

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 170

• Message text: $$projection is not supported in abstract entities

Self-Explanatory Message

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SDDL_PARSER_MSG170 - Details

• The SAP error message SDDL_PARSER_MSG170 with the description $$projection is not supported in abstract entities typically occurs in the context of SAP's OData services or when working with the SAP Gateway. This error indicates that there is an attempt to use a projection (which is a way to select specific fields from an entity) on an abstract entity type, which is not allowed.
  
  Cause:
  
  Abstract Entity Type: The entity you are trying to project from is defined as an abstract entity in the OData model. Abstract entities are meant to be base types that cannot be instantiated directly and are usually used for inheritance.
  Projection Usage: The projection syntax (e.g., using $$projection in your OData query) is being applied to an abstract entity, which is not supported by the OData service.
  
  
  Solution:
  
  Check Entity Definition: Review the definition of the entity in your OData model. If it is marked as abstract, you cannot use projections