How To Fix WF800 - Process function module left without action

SAP Error Message - Details

• Message type: E = Error

• Message class: WF - Workflow: messages

• Message number: 800

• Message text: Process function module left without action

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WF800 - Process function module left without action ?

  The SAP error message WF800: Process function module left without action occurs in the context of SAP Workflow. It indicates that a workflow process function module was called but did not perform any action or did not return the expected result, causing the workflow to stop or behave unexpectedly.
  
  Cause
  
  The process function module (a custom or standard function module called within a workflow step) did not execute any action or did not set the required output parameters.
  The function module might have ended prematurely, for example due to an error or missing logic.
  The function module did not call the SAP_WAPI_RETURN function module or did not set the return code properly.
  The workflow container elements expected to be changed or updated by the function module were not touched.
  The function module did not call SAP_WAPI_PROCESS_DECISION or SAP_WAPI_PROCESS_EVENT to continue the workflow.
  Sometimes, the function module is missing or incorrectly assigned in the workflow step.
  
  
  Explanation
  In SAP Workflow, process steps can be implemented using function modules. These function modules are expected to perform some action and then inform the workflow runtime about the result by returning a status or triggering an event. If the function module finishes without doing anything or without signaling the workflow engine, the workflow engine raises the WF800 error.
  
  Solution
  
  
  Check the Process Function Module:
  
  Verify the function module assigned to the workflow step.
  Ensure the function module contains the necessary logic to perform the intended action.
  Make sure the function module calls SAP_WAPI_RETURN or sets the return code properly.
  If the function module is supposed to trigger a decision or event, ensure it calls SAP_WAPI_PROCESS_DECISION or SAP_WAPI_PROCESS_EVENT.
  
  
  
  Debug the Function Module:
  
  Set a breakpoint in the function module.
  Execute the workflow step and check if the function module is called.
  Check if the function module completes successfully and returns the expected output.
  
  
  
  Check Workflow Container:
  
  Verify that the workflow container elements expected to be changed by the function module are correctly updated.
  If the function module is supposed to change container elements, ensure it does so.
  
  
  
  Check Workflow Step Configuration:
  
  In transaction PFTC (Task Maintenance), check the method or function module assigned to the workflow step.
  Ensure the correct function module is assigned.
  
  
  
  Review SAP Notes and Documentation:
  
  Sometimes, SAP provides notes for specific issues related to workflow errors.
  Search SAP Support Portal for notes related to WF800.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SWI1 - Workflow Log (to analyze the workflow run and error)
  SWDD - Workflow Builder (to check the workflow design)
  PFTC - Task Maintenance (to check the function module assigned)
  SE37 - Function Builder (to check/debug the function module)
  
  
  
  SAP Help:
  
  SAP Workflow documentation on process steps and function modules.
  SAP Note 0000000 (replace with actual note number if found).
  
  
  
  Common Function Modules:
  
  SAP_WAPI_RETURN - to return status to the workflow engine.
  SAP_WAPI_PROCESS_DECISION - to process decisions.
  SAP_WAPI_PROCESS_EVENT - to trigger events.
  
  
  
  
  Summary
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Process function module did not perform any action or did not return expected result.
  
  
  Effect
  Workflow engine raises WF800 error and workflow step fails or stops.
  
  
  Solution
  Check and correct the function module logic, ensure proper return/status calls are made.
  
  
  Tools
  SWI1 (log), SWDD (workflow), PFTC (task), SE37 (function module debugging)
  
  
  Related Calls
  SAP_WAPI_RETURN, SAP_WAPI_PROCESS_DECISION, SAP_WAPI_PROCESS_EVENT
  
  
  
  
  If you provide the name of the function module or workflow step, I can help you analyze it further.