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

WVLB021 - Overview

• 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