How To Fix FL386 - No reference types are allowed in RFC

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 386

• Message text: No reference types are allowed in RFC

What causes this issue?

You tried to assign a refrence type to a parameter of a function module
that can be called remotely (for example containing references to
objects or fields). This is not supported.

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 FL386 - No reference types are allowed in RFC ?

  The SAP error message FL386: No reference types are allowed in RFC typically occurs when you are trying to use a reference type (like a reference variable or a reference object) in a Remote Function Call (RFC) context. RFC is designed to work with data types that can be serialized and transmitted over the network, and reference types do not meet this requirement.
  Cause:
  
  Reference Types in RFC: The primary cause of this error is the use of reference types (like class references or interface references) in the parameters of an RFC-enabled function module or method. RFC requires that all parameters be of value types (like structures, tables, or simple data types).
  Incorrect Function Module Definition: If a function module is defined with reference types in its interface, it will trigger this error when called remotely.
  
  Solution:
  
  
  Change Parameter Types: Modify the function module or method to use value types instead of reference types. This means using structures, tables, or simple data types (like integers, strings, etc.) as parameters.
  
  For example, if you have a parameter defined as a reference to a class, change it to a structure that contains the necessary data.
  
  
  
  Use Value Objects: If you need to pass complex data, consider using value objects (like structures or internal tables) that can encapsulate the necessary information without using references.
  
  
  Check RFC Function Module: If you are calling an RFC function module, ensure that the parameters you are passing are not reference types. You may need to create a wrapper or a different function module that converts reference types to value types.
  
  
  Related Information:
  
  RFC and Serialization: Understand that RFC requires data to be serializable, which means it must be able to be converted into a format that can be transmitted over the network. Reference types do not meet this requirement.
  SAP Documentation: Refer to the SAP documentation for guidelines on defining RFC-enabled function modules and the types of parameters that can be used.
  ABAP Development Guidelines: Familiarize yourself with ABAP development best practices, especially regarding data types and RFC usage.
  
  By ensuring that all parameters in your RFC-enabled function modules are value types, you can avoid the FL386 error and ensure smooth communication between SAP systems.