How To Fix WER166 - DDIC type &1 is not supported as a return parameter

WER166 - Overview

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 166

• Message text: DDIC type &1 is not supported as a return parameter

Self-Explanatory Message

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• What is the cause and solution for SAP error message WER166 - DDIC type &1 is not supported as a return parameter ?

  SAP Error Message:
  WER166 - DDIC type &1 is not supported as a return parameter
  
  Cause
  This error occurs when a function module or method is defined with a return parameter whose data type is a Data Dictionary (DDIC) type that is not supported as a return parameter. In SAP ABAP, certain DDIC types cannot be used directly as return parameters in function modules or methods. For example, complex types like table types, deep structures, or certain reference types are not allowed as return parameters.
  The system checks the return parameter's type during the activation or runtime of the function module/method and raises this error if the type is unsupported.
  
  Explanation
  
  Return parameters in function modules or methods must be of a type that can be passed back as a single value.
  Unsupported DDIC types include:
  Table types (internal tables)
  Deep structures
  Certain reference types
  Possibly some complex or nested types
  
  
  Supported types are usually elementary types or flat structures.
  
  
  Solution
  
  
  Change the return