How To Fix E1121 - Output mode for asynchronous RFC is not permitted: &

SAP Error Message - Details

• Message type: E = Error

• Message class: E1 - Messages for IDoc Basis

• Message number: 121

• Message text: Output mode for asynchronous RFC is not permitted: &

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message E1121 - Output mode for asynchronous RFC is not permitted: & ?

  The SAP error message E1121, which states "Output mode for asynchronous RFC is not permitted: &," typically occurs when there is an attempt to use an output mode that is not compatible with asynchronous Remote Function Calls (RFC). This error is often encountered in scenarios where a function module is called asynchronously, but the output parameters are not handled correctly.
  Cause:
  
  Incompatible Output Mode: The function module being called asynchronously is trying to return output parameters, which is not allowed in asynchronous RFC. Asynchronous RFC is designed for scenarios where the caller does not need to wait for a response.
  Function Module Definition: The function module may be defined with output parameters, which is incompatible with the asynchronous RFC call.
  Incorrect Call Method: The calling program may be using an incorrect method to invoke the function module, leading to this error.
  
  Solution:
  
  
  Check Function Module Definition: Review the function module being called to ensure it is defined correctly for asynchronous RFC. If it has output parameters, consider changing it to use input parameters only or redesigning the function to return results through a different mechanism (e.g., using a database table or a queue).
  
  
  Use Synchronous RFC: If the requirement is to get output from the function module, consider using synchronous RFC (sRFC) instead of asynchronous RFC (aRFC). This way, the caller can wait for the response and handle the output parameters appropriately.
  
  
  Modify the Calling Program: If the calling program is incorrectly set up to expect output parameters from an asynchronous call, modify it to either not expect output or to handle the output in a different way.
  
  
  Review RFC Settings: Ensure that the RFC destination and settings are correctly configured for the type of call being made.
  
  
  Related Information:
  
  
  RFC Types: Understand the different types of RFCs in SAP:
  
  Synchronous RFC (sRFC): The caller waits for the function to complete and can receive output parameters.
  Asynchronous RFC (aRFC): The caller does not wait for the function to complete and cannot receive output parameters.
  Transactional RFC (tRFC): Similar to aRFC but ensures that the call is executed exactly once.
  
  
  
  SAP Documentation: Refer to SAP Help documentation for more details on RFC programming and guidelines for defining function modules.
  
  
  Debugging: If the issue persists, consider using transaction codes like SM58 (for monitoring tRFC) or SLG1 (for application log) to gather more information about the error context.
  
  
  By following these steps, you should be able to resolve the E1121 error and ensure that your RFC calls are set up correctly.