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

SAP Error Message - Details

• 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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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG516 - $$projection is allowed only for simple fields in the select list ?

  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 from the select list.
  
  
  Modify the Query: If you need to include complex fields, consider restructuring your query. You may need to perform additional processing after the initial SELECT to handle complex data types.
  
  
  Check Data Types: Verify the data types of the fields you are trying to project. Ensure that they are indeed simple fields as defined by SAP.
  
  
  Consult Documentation: Refer to the SAP documentation for the specific version you are using to understand the limitations and requirements for projections in SELECT statements.
  
  
  Testing: After making changes, test the query again to ensure that the error is resolved.
  
  
  Related Information:
  
  SAP ABAP Documentation: Look into the official SAP ABAP documentation for more details on SELECT statements and projections.
  Data Dictionary: Use the Data Dictionary (SE11) to check the definitions of the fields you are working with to confirm their types.
  Community Forums: If you continue to face issues, consider reaching out to SAP community forums or support for additional insights and assistance.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.