How To Fix FL393 - You can only use LIKE and TYPE to specify types in RFC

FL393 - Overview

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 393

• Message text: You can only use LIKE and TYPE to specify types in RFC

What causes this issue?

At the moment RFC only allows parameter types defined with LIKE and
TYPE. Other type categories such as TYPE REF TO are not supported for
RFC-compatible function modules.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

FL393 - Details

• The SAP error message FL393, "You can only use LIKE and TYPE to specify types in RFC," typically occurs when there is an issue with the way data types are defined in a Remote Function Call (RFC) interface. This error indicates that the system does not allow certain type specifications in the context of RFCs.
  
  Cause:
  
  Invalid Type Specification: The error is often caused by using type specifications that are not allowed in RFCs. In RFCs, you can only use LIKE and TYPE to define the types of parameters.
  Complex Data Types: If you are trying to use complex data types (like structures or tables) in the RFC interface, it may lead to this error if they are not defined correctly.
  Inconsistent Data Types: If the data types in the RFC interface do not match the expected types in the calling program, it can also trigger this error.
  
  
  Solution:
  
  Check Type Definitions: Review the parameter definitions