How To Fix WD294 - No last message found

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 294

• Message text: No last message found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD294 - No last message found ?

  The SAP error message WD294 No last message found typically occurs in the context of Web Dynpro applications. It indicates that the framework expected to find a "last message" in the message container or message manager, but none was available at the time it tried to retrieve it.
  
  Cause
  
  No message stored in the message container: The Web Dynpro component or application tried to access the last message (e.g., to display it in a message area or to process it further), but no message was previously added to the message container.
  Message container cleared or not initialized: Sometimes, the message container might have been cleared or not properly initialized before the retrieval attempt.
  Incorrect message handling logic: The application logic might be trying to fetch a message without ensuring that a message exists, or the message retrieval is done at an inappropriate point in the application flow.
  
  
  When does it occur?
  
  When calling methods like getLastMessage() on the message manager or message container, but no message has been added yet.
  During navigation or UI update phases where the framework expects a message to be present.
  In custom Web Dynpro components or applications where message handling is manually implemented.
  
  
  Solution
  
  
  Check message creation logic:
  
  Ensure that messages are properly created and added to the message container before trying to retrieve the last message.
  Example:
  wd_context->get_message_manager( )->add_message(
    iv_msgid = 'ZMSG'
    iv_msgty = 'E'
    iv_msgno = '001'
    iv_msgv1 = 'Sample error'
  ).
  
  
  
  
  Guard message retrieval:
  
  
  Before calling getLastMessage(), check if there are any messages available.
  
  
  Example:
  DATA: lo_msg_mgr TYPE REF TO if_wd_message_manager,
        lo_msg     TYPE REF TO if_wd_message.
  
  lo_msg_mgr = wd_context->get_message_manager( ).
  IF lo_msg_mgr->has_messages( ) = abap_true.
    lo_msg = lo_msg_mgr->get_last_message( ).
    " Process message
  ELSE.
    " Handle case when no message exists
  ENDIF.
  
  
  
  
  Review application flow:
  
  Make sure that the message retrieval is done after message creation and not before.
  Avoid clearing the message container before the retrieval if the message is still needed.
  
  
  
  Debugging:
  
  Use the debugger to check the state of the message container at the point where the error occurs.
  Verify if any messages exist and if the message container is properly initialized.
  
  
  
  
  Related Information
  
  Message Handling in Web Dynpro: SAP Web Dynpro uses a message manager to handle messages (errors, warnings, info). Messages are stored in a message container and can be retrieved or displayed in the UI.
  SAP Note / Documentation: Check SAP Notes or the official SAP Help Portal for any updates or patches related to message handling in your specific SAP NetWeaver or Web Dynpro version.
  Common Methods:
  
  IF_WD_MESSAGE_MANAGER~ADD_MESSAGE
  IF_WD_MESSAGE_MANAGER~GET_LAST_MESSAGE
  IF_WD_MESSAGE_MANAGER~HAS_MESSAGES
  
  
  
  
  Summary
  
  
  
  Aspect
  Description
  
  
  
  
  Error
  WD294 No last message found
  
  
  Cause
  Attempt to retrieve a last message when none exists in the message container
  
  
  Solution
  Ensure messages are added before retrieval; check for messages before calling getLastMessage()
  
  
  Context
  Web Dynpro message handling, message manager, UI message display
  
  
  
  
  If you provide the specific code snippet or scenario where this error occurs, I can help you with a more tailored solution.