How To Fix UBD_REMOTE002 - Only static methods can be called over system boundaries

SAP Error Message - Details

• Message type: E = Error

• Message class: UBD_REMOTE - Web FIN Survey: Business Domain Lib Remote Modules

• Message number: 002

• Message text: Only static methods can be called over system boundaries

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UBD_REMOTE002 - Only static methods can be called over system boundaries ?

  The SAP error message UBD_REMOTE002: Only static methods can be called over system boundaries typically occurs in the context of SAP Business Application Programming (ABAP) when you are trying to call a method that is not static from a remote system or service. This is a common issue when working with Remote Function Calls (RFC) or Web Services in SAP.
  Cause:
  The error arises because:
  
  Non-Static Method Call: You are attempting to invoke an instance method (non-static) from a remote system. In ABAP, only static methods can be called across system boundaries due to the way the RFC mechanism works.
  Object Context: Non-static methods require an instance of the class to be created, which is not possible in a remote call context where the system does not have access to the instance of the class.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Change Method to Static: If the method does not rely on instance variables or state, consider changing the method to a static method. This allows it to be called remotely without needing an instance of the class.
  CLASS my_class DEFINITION.
    CLASS-METHODS my_static_method.
  ENDCLASS.
  
  CLASS my_class IMPLEMENTATION.
    METHOD my_static_method.
      " Your code here
    ENDMETHOD.
  ENDCLASS.
  
  
  Create a Wrapper Function Module: If the method needs to remain non-static (because it relies on instance variables), you can create a wrapper function module that calls the non-static method internally. The function module can be defined as an RFC-enabled function module.
  FUNCTION z_my_function_module.
    DATA: lo_instance TYPE REF TO my_class.
    CREATE OBJECT lo_instance.
    lo_instance->my_non_static_method( ).
  ENDFUNCTION.
  
  
  Review Method Logic: Ensure that the logic within the method can be executed in a static context if you decide to convert it to a static method. This may involve refactoring the code to avoid reliance on instance-specific data.
  
  
  Check RFC Configuration: Ensure that the RFC destination and configuration are correctly set up to allow for remote calls.
  
  
  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.
  Static vs. Instance Methods: Static methods belong to the class itself and do not require an instance of the class to be called, while instance methods require an object of the class.
  SAP Documentation: Refer to the official SAP documentation for more details on RFC and method definitions in ABAP.
  
  By following these steps, you should be able to resolve the UBD_REMOTE002 error and successfully call the desired method across system boundaries.