How To Fix WT235 - Error while starting RFC: All PBT resources are currently busy

SAP Error Message - Details

• Message type: E = Error

• Message class: WT - Retail: Replenishment

• Message number: 235

• Message text: Error while starting RFC: All PBT resources are currently busy

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WT235 - Error while starting RFC: All PBT resources are currently busy ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WT235 - Error while starting RFC: All PBT resources are currently busy
  
  Cause:
  This error occurs when the SAP system tries to start an RFC (Remote Function Call) connection to the Process Batch Task (PBT) resources, but all available PBT resources are currently occupied or busy. PBT resources are used in SAP for parallel processing of batch jobs or tasks, especially in the context of workflow or background processing.
  In other words, the system has a limited number of PBT resources configured, and all of them are currently in use, so no new RFC calls can be started until some resources are freed.
  
  Explanation:
  
  PBT (Process Batch Task) resources are worker processes or background tasks that handle parallel execution of batch jobs or workflow tasks.
  When the system tries to initiate a new RFC call to a PBT resource, it checks for available resources.
  If all PBT resources are busy (e.g., processing other tasks), the system cannot allocate a new one, resulting in this error.
  This situation can happen if there is a high load of batch jobs or if some PBT resources are stuck or not released properly.
  
  
  Solution:
  
  
  Check PBT Resource Usage:
  
  Use transaction SM50 or SM66 to monitor the work processes and check if PBT resources are busy or stuck.
  Identify if there are long-running or stuck processes that are occupying PBT resources.
  
  
  
  Increase Number of PBT Resources:
  
  If the system frequently runs out of PBT resources, consider increasing the number of PBT resources configured.
  This can be done by adjusting the profile parameters related to batch or background processing, or by increasing the number of dialog or background work processes depending on your system setup.
  
  
  
  Release or Restart Stuck Processes:
  
  If some PBT resources are stuck, try to cancel or terminate those processes.
  In some cases, a system restart or work process restart might be necessary to free up resources.
  
  
  
  Check RFC Destinations:
  
  Verify the RFC destinations used for PBT calls in transaction SM59.
  Ensure that the RFC destinations are correctly configured and reachable.
  
  
  
  Review System Load and Batch Job Scheduling:
  
  Analyze the batch job scheduling to avoid overloading the system with too many parallel jobs.
  Spread out batch jobs or workflow tasks to reduce simultaneous demand on PBT resources.
  
  
  
  SAP Notes and Support:
  
  Check SAP Notes for any known issues related to WT235 or PBT resource management.
  For example, SAP Note 1234567 (example) might provide patches or recommendations.
  
  
  
  
  Related Information:
  
  
  Transactions to monitor and manage:
  
  SM50 - Work Process Overview
  SM66 - Global Work Process Overview
  SM37 - Job Monitoring
  SM59 - RFC Destinations
  
  
  
  Profile Parameters:
  
  Parameters related to background work processes or batch task handling might need adjustment.
  For example, rdisp/wp_no_btc (number of background work processes).
  
  
  
  System Logs:
  
  Check system logs (transaction SM21) for related errors or warnings.
  
  
  
  Workflow and Batch Processing:
  
  If the error occurs in the context of workflow, check workflow logs (transaction SWI1) for stuck or long-running tasks.
  
  
  
  
  Summary:
  The error WT235 indicates that all PBT resources are busy, preventing new RFC calls to start. The solution involves monitoring and managing PBT resource usage, increasing resource availability if needed, and ensuring that no processes are stuck or blocking resources.
  
  If you need help with specific commands or further troubleshooting steps, feel free to ask!