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.