How To Fix SDDL_PARSER_MSG516 - $$projection is allowed only for simple fields in the select list

SDDL_PARSER_MSG516 - Overview

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 516

• Message text: $$projection is allowed only for simple fields in the select list

Self-Explanatory Message

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SDDL_PARSER_MSG516 - Details

• The SAP error message SDDL_PARSER_MSG516 indicates that there is an issue with the use of projections in a SELECT statement within the context of SAP's ABAP programming or data modeling. Specifically, the error message states that projections are only allowed for simple fields in the select list. 
  
  Cause:
  This error typically occurs when you attempt to use a projection (which is a way to select specific fields from a data source) on a complex field or a field that does not meet the criteria for a simple field. In SAP, a "simple field" usually refers to basic data types (like integers, strings, etc.) that do not involve complex structures or nested data types.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the SELECT Statement: Check the SELECT statement where the error is occurring. Ensure that you are only using simple fields in the projection. Remove any complex fields or structures