How To Fix WRF_AT_GENERATE303 - Number of items per process is empty -> no parallel processing

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_AT_GENERATE - Messages: Allocation Table Generation RTFASH/Ordering

• Message number: 303

• Message text: Number of items per process is empty -> no parallel processing

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_AT_GENERATE303 - Number of items per process is empty -> no parallel processing ?

  The SAP error message:
  WRF_AT_GENERATE303 Number of items per process is empty -> no parallel processing
  
  Cause:
  This error occurs during the execution of a workflow or background job that involves parallel processing. Specifically, the system expects a parameter that defines the number of items per process (i.e., how many work items or tasks should be processed in parallel per process). If this parameter is missing, empty, or incorrectly set, the system cannot determine how to split the workload for parallel execution, resulting in this error.
  In other words, the system tries to initiate parallel processing but finds that the configuration for the number of items per process is not provided or is zero/empty, so it cannot proceed.
  
  When does it typically occur?
  
  During workflow generation or execution where parallel processing is configured.
  When using SAP Workflow Runtime Framework (WRF) or related background job processing.
  When customizing or running reports/programs that support parallel processing but lack proper parameter settings.
  
  
  Solution:
  
  
  Check the parameter for "Number of items per process":
  
  Identify where this parameter is set. It could be in:
  
  Workflow customizing.
  Job variant or selection screen.
  Program parameters.
  
  
  Make sure it is not empty or zero.
  Set a valid number (e.g., 10, 50, 100) depending on the workload and system capacity.
  
  
  
  Adjust the parallel processing settings:
  
  If you are running a report or program that supports parallel processing, check the selection screen or variant for the field controlling the number of items per process.
  Enter a suitable value.
  
  
  
  Check workflow customizing:
  
  In transaction SWDD (Workflow Builder) or SWU3 (Workflow Runtime Tools), verify if the workflow step or container element controlling parallel processing is correctly configured.
  Ensure that the workflow container element or the method that determines the number of items per process is correctly filled.
  
  
  
  Review program documentation or SAP Notes:
  
  Some SAP standard programs or workflows require specific parameters to be set for parallel processing.
  Refer to the documentation or SAP Notes related to the specific program or workflow.
  
  
  
  Debugging:
  
  If the cause is unclear, debug the program or workflow to see where the parameter is read and why it is empty.
  Check if the parameter is passed correctly from the selection screen or workflow container.
  
  
  
  
  Related Information:
  
  Parallel processing in SAP: It is a technique to improve performance by splitting a large workload into smaller chunks processed simultaneously.
  Workflow Runtime Framework (WRF): Used in SAP to manage workflows and background processing.
  Transaction codes:
  
  SWDD: Workflow Builder.
  SWU3: Workflow Runtime Tools.
  SM37: Job monitoring.
  
  
  SAP Notes: Search for notes related to WRF_AT_GENERATE303 or parallel processing errors.
  SAP forums and OSS: Often, similar issues are discussed with specific solutions or patches.
  
  
  Summary:
  
  Cause: Missing or empty parameter for "number of items per process" in parallel processing setup.
  Solution: Provide a valid number for this parameter in the workflow, job variant, or program selection screen.
  Check: Workflow customizing, program parameters, and debug if necessary.
  
  
  If you provide the exact context (program name, transaction, or workflow), I can help you with more specific instructions.