How To Fix WVLB021 - Int. program start and simultaneous parallel processing are not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: WVLB - Messages for Load Building

• Message number: 021

• Message text: Int. program start and simultaneous parallel processing are not possible

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WVLB021 - Int. program start and simultaneous parallel processing are not possible ?

  The SAP error message WVLB021 indicates that there is an issue with starting an internal program while simultaneous parallel processing is not allowed. This typically occurs in scenarios where a background job or a parallel processing request is being initiated, but the system settings or the current state of the job do not permit it.
  Cause:
  
  Parallel Processing Restrictions: The system may be configured to restrict parallel processing for certain jobs or programs. This can be due to resource constraints or specific settings in the job definition.
  Job Already Running: If the job is already running in the background, attempting to start it again in parallel may trigger this error.
  Configuration Settings: The configuration settings for the specific program or transaction may not allow for parallel execution.
  Locking Mechanisms: There may be locking mechanisms in place that prevent the program from being executed in parallel.
  
  Solution:
  
  Check Job Status: Verify if the job is already running. You can do this by checking the job overview in transaction SM37. If it is running, you may need to wait for it to complete.
  Review Job Configuration: Check the configuration of the job in transaction SM36. Ensure that the job is set up to allow parallel processing if that is required.
  Adjust Parallel Processing Settings: If you have the necessary authorizations, you can adjust the settings to allow for parallel processing. This may involve changing parameters in the job definition or the program itself.
  Consult Documentation: Review the documentation for the specific program or transaction to understand its requirements and limitations regarding parallel processing.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  Transaction Codes: 
  
  SM37: Job Monitoring
  SM36: Job Definition
  SM21: System Log
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  System Configuration: Review the system configuration related to background processing and parallel processing settings.
  
  By following these steps, you should be able to diagnose and resolve the WVLB021 error in your SAP system.