How To Fix SDDL_PARSER_MSG103 - Either "WITH PARAMETERS" or "RETURNS" was expected here

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 103

• Message text: Either "WITH PARAMETERS" or "RETURNS" was expected here

What causes this issue?

Instead of '&V1&', the specification of a list of importing parameters
with 'WITH PARAMETERS' or the specification of the return parameters
with 'RETURNS' is expected at this position.
This error can occur, for example, whenever the function name is missing
or whenever the keyword is incorrect or was written incorrectly. (
<DS:ABEN.CDS_F1_DEFINE_TABLE_FUNCTION>CDS-Tabellenfunktionen</>)

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG103 - Either "WITH PARAMETERS" or "RETURNS" was expected here ?

  The SAP error message SDDL_PARSER_MSG103 indicates that there is a syntax issue in the definition of a service definition language (SDL) or service interface in SAP. Specifically, the error suggests that the parser was expecting either the "WITH PARAMETERS" clause or the "RETURNS" clause in the service definition, but it did not find either of them.
  
  Cause:
  This error typically occurs due to one of the following reasons:
  
  Missing Clause: The service definition is incomplete and does not include the required "WITH PARAMETERS" or "RETURNS" clause.
  Incorrect Syntax: There may be a syntax error in the service definition that prevents the parser from correctly interpreting the structure.
  Misplaced Keywords: The keywords may be in the wrong order or incorrectly placed within the service definition.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Service Definition: Review the service definition where the error occurred. Ensure that it includes the necessary clauses:
  
  If your service is supposed