How To Fix WA847 - Error reading event

SAP Error Message - Details

• Message type: E = Error

• Message class: WA - Messages from Workflow Event Manager

• Message number: 847

• Message text: Error reading event

What causes this issue?

The event was to be read for the current operation. An error occurred
doing this. This error may have arisen because the event data changed
in the meantime.

System Response

Processing was aborted.

How to fix this error?

Update the data and start the operation again.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

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• What is the cause and solution for SAP error message WA847 - Error reading event ?

  SAP Error Message:
  
  WA847 - Error reading event
  
  Cause:
  The error message WA847 - Error reading event typically occurs in SAP systems when there is a problem reading an event from the event queue or event buffer. This can happen due to:
  
  Corruption or inconsistency in the event queue.
  Issues with the event processing mechanism.
  Problems with the communication between different SAP components or external systems.
  Database or buffer inconsistencies.
  Insufficient authorizations or system resource limitations.
  Network or communication errors in distributed environments.
  
  
  Explanation:
  In SAP, events are used to trigger certain processes or workflows asynchronously. The system places events in an event queue, and these events are read and processed by event handlers. If the system encounters an issue while reading an event (e.g., the event data is corrupted, missing, or the event queue is inaccessible), it raises the WA847 error.
  
  Common Scenarios:
  
  During workflow processing.
  When using event-driven batch jobs.
  In ALE/IDoc processing where events trigger further processing.
  In dialog or background processing where events are used for synchronization.
  
  
  Solutions / Troubleshooting Steps:
  
  
  Check System Logs:
  
  Use transaction SM21 to check system logs for related errors or warnings around the time WA847 occurred.
  Look for database errors, communication errors, or resource issues.
  
  
  
  Check Event Queue:
  
  Use transaction SMQ1 (Outbound Queue) and SMQ2 (Inbound Queue) to check for stuck or inconsistent queues.
  Clear or restart queues if necessary.
  
  
  
  Restart Event Processing:
  
  Sometimes restarting the event processing or the related work processes can resolve transient issues.
  Use transaction SM50 or SM66 to monitor and restart work processes if needed.
  
  
  
  Check Authorizations:
  
  Ensure the user or process reading the event has the necessary authorizations.
  
  
  
  Database Consistency:
  
  Run database consistency checks if corruption is suspected.
  Consult BASIS team for database health checks.
  
  
  
  Check Network/Communication:
  
  If events are triggered across systems (e.g., ALE), verify network connectivity and RFC destinations (transaction SM59).
  
  
  
  Apply SAP Notes:
  
  Search SAP Support Portal for notes related to WA847.
  Sometimes SAP releases patches or notes addressing specific event reading issues.
  
  
  
  Debugging:
  
  If you have development access, debug the program or function module where the error occurs to identify the exact cause.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM21 - System Log
  SMQ1 / SMQ2 - Queue Monitoring
  SM50 / SM66 - Work Process Monitoring
  SM59 - RFC Destinations
  
  
  
  SAP Notes:
  
  Check SAP ONE Support Launchpad for notes referencing WA847.
  Example search terms: "WA847 error reading event", "event queue error", "event processing error".
  
  
  
  Documentation:
  
  SAP Help Portal sections on event handling and workflow.
  Basis administration guides on queue and event management.
  
  
  
  
  Summary:
  WA847 - Error reading event indicates a problem with reading an event from the SAP event queue. The root cause can be queue corruption, communication issues, authorization problems, or system resource constraints. Troubleshooting involves checking system logs, queues, authorizations, and network connectivity, and applying relevant SAP Notes or patches.
  
  If you provide more context (e.g., when the error occurs, transaction or process involved), I can help with more specific guidance.