How To Fix WA654 - Receiver function module &: Parameter & is not optional

SAP Error Message - Details

• Message type: E = Error

• Message class: WA - Messages from Workflow Event Manager

• Message number: 654

• Message text: Receiver function module &: Parameter & is not optional

What causes this issue?

The specified parameter of the specified receiver function module is
not optional. Since it is not filled when SWE_EVENT_CREATE is called,
this is not allowed.

System Response

The action was terminated, the event was not triggered.

How to fix this error?

Define the specified parameter as optional and assign it a standard
value.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WA654 - Receiver function module &: Parameter & is not optional ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WA654 Receiver function module &: Parameter & is not optional
  
  Cause:
  This error occurs when a remote function call (RFC) or a BAPI is invoked, and the receiver function module expects a certain parameter to be passed, but the calling program or interface is not providing it. The parameter in question is defined as mandatory (not optional) in the function module's interface, so omitting it leads to this error.
  In other words, the function module you are trying to call requires a specific parameter, but the parameter is missing or not supplied in the call.
  
  Explanation:
  
  
  The message text indicates:
  
  & (first placeholder) = the name of the receiver function module.
  & (second placeholder) = the name of the parameter that is missing but required.
  
  
  
  This typically happens in scenarios involving:
  
  Remote Function Calls (RFC)
  BAPI calls
  ALE/IDoc processing where a function module is called remotely
  Custom developments or enhancements where function modules are called programmatically
  
  
  
  
  Solution:
  
  
  Check the Function Module Interface:
  
  Go to transaction SE37.
  Enter the function module name (from the error message).
  Check the interface tab to identify the parameter that is mandatory.
  
  
  
  Review the Calling Program or Interface:
  
  Identify where the function module is being called.
  Ensure that the mandatory parameter is being passed correctly.
  If the parameter is missing, modify the calling code or configuration to include it.
  
  
  
  Adjust the Parameter Passing:
  
  If the parameter is a structure or table, ensure it is properly filled.
  If the parameter is a simple data element, ensure it is not initial or empty.
  
  
  
  If the Parameter Should Be Optional:
  
  If you have control over the function module and the parameter should be optional, you can:
  
  Change the parameter definition in the function module interface to optional.
  This requires careful consideration and testing, as it may affect other callers.
  
  
  
  
  
  Check for Notes or Known Issues:
  
  Sometimes SAP provides OSS Notes related to specific function modules or BAPIs.
  Search SAP Support Portal with the function module name and error message.
  
  
  
  
  Related Information:
  
  Transaction SE37: To check function module interface.
  Transaction SE80: To check programs or function groups calling the function module.
  Transaction SM59: To check RFC destinations if the call is remote.
  Debugging: You can debug the call to see what parameters are passed.
  SAP OSS Notes: Search for the error message or function module name for any SAP corrections or recommendations.
  
  
  Example:
  If the error message is:
  
  WA654 Receiver function module 'Z_MY_FUNCTION_MODULE': Parameter 'IV_MANDATORY_PARAM' is not optional
  
  You must ensure that when calling Z_MY_FUNCTION_MODULE, the parameter IV_MANDATORY_PARAM is always passed with a valid value.
  
  
  If you provide the exact function module name and parameter, I can help you with more specific guidance.