How To Fix FL396 - No types from classes or interfaces are allowed for RFC

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 396

• Message text: No types from classes or interfaces are allowed for RFC

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FL396 - No types from classes or interfaces are allowed for RFC ?

  The SAP error message FL396: No types from classes or interfaces are allowed for RFC typically occurs when you are trying to use a class or interface type in a Remote Function Call (RFC) context. RFCs are designed to work with simple data types and structures, and they do not support complex types like classes or interfaces.
  Cause:
  The error is caused by attempting to define an RFC-enabled function module or method that includes parameters of class or interface types. RFC requires that all parameters be of simple types (like integers, strings, or structures) or tables of these types.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Change Parameter Types: 
  
  Review the function module or method signature and replace any class or interface parameters with simple types or structures. 
  If you need to pass complex data, consider using a structure that contains the necessary fields instead of a class.
  
  
  
  Use Structures: 
  
  Define a structure that contains the fields you need and use that structure as a parameter in your RFC-enabled function module or method.
  
  
  
  Avoid Class/Interface Types: 
  
  Ensure that you are not using any class or interface types in the parameters of your RFC-enabled methods. This includes both input and output parameters.
  
  
  
  Check for Inheritance: 
  
  If you are using inheritance, ensure that the parameters are not derived from a class or interface.
  
  
  
  Testing: 
  
  After making the necessary changes, test the RFC call again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  RFC (Remote Function Call): A protocol used in SAP to enable communication between different SAP systems or between SAP and non-SAP systems.
  Data Types in RFC: RFC supports basic data types (like CHAR, INT, etc.) and structures but does not support object-oriented programming constructs like classes and interfaces.
  SAP Documentation: For more detailed information, refer to the SAP Help Portal or the ABAP documentation regarding RFC-enabled function modules and data types.
  
  By following these guidelines, you should be able to resolve the FL396 error and successfully implement your RFC-enabled function module or method.