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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL393 - You can only use LIKE and TYPE to specify types in RFC ?

  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 in the RFC function module. Ensure that you are using LIKE or TYPE for defining the types of parameters.
  Use Simple Data Types: If possible, use simple data types (like CHAR, INT, etc.) instead of complex structures or tables in the RFC interface.
  Redefine Structures: If you need to use structures, ensure that they are defined in a way that is compatible with RFC. You may need to create a simpler version of the structure or use a flat structure.
  Adjust Calling Program: Ensure that the calling program is using the correct data types that match the RFC interface. This includes checking for any discrepancies in the data types being passed.
  
  Related Information:
  
  RFC Function Module: When creating or modifying RFC function modules, always adhere to the guidelines for parameter types.
  SAP Documentation: Refer to the SAP Help Portal or the ABAP documentation for more details on RFCs and data type specifications.
  Testing: After making changes, test the RFC call to ensure that the error is resolved and that the data is being passed correctly.
  
  By following these steps, you should be able to resolve the FL393 error and ensure that your RFC function module is correctly defined.