How To Fix /SAPAPO/PP_OPTIMIZER809 - Starting dual simplex algorithm

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/PP_OPTIMIZER -

• Message number: 809

• Message text: Starting dual simplex algorithm

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/PP_OPTIMIZER809 - Starting dual simplex algorithm ?

  The SAP error message /SAPAPO/PP_OPTIMIZER809 typically indicates an issue related to the optimization process in SAP Advanced Planning and Optimization (APO). This message is associated with the dual simplex algorithm, which is used for solving linear programming problems in the context of production planning and scheduling.
  Cause:
  The error can arise due to several reasons, including but not limited to:
  
  Model Infeasibility: The optimization model may be infeasible, meaning that there are no solutions that satisfy all constraints.
  Data Issues: Incorrect or inconsistent data in the planning model, such as missing or incorrect master data, can lead to problems during optimization.
  Resource Constraints: Over-constrained resources or conflicting constraints can prevent the optimizer from finding a feasible solution.
  Parameter Settings: Incorrect settings in the optimizer configuration can lead to issues during the optimization process.
  
  Solution:
  To resolve the error, consider the following steps:
  
  
  Check Model Feasibility:
  
  Review the constraints and ensure that they are not overly restrictive.
  Analyze the input data for inconsistencies or errors.
  
  
  
  Data Validation:
  
  Verify that all relevant master data (e.g., materials, resources, production versions) is correctly maintained and up to date.
  Ensure that all necessary planning data is available and correctly configured.
  
  
  
  Review Constraints:
  
  Examine the constraints defined in the planning model to ensure they are realistic and do not conflict with each other.
  Simplify or relax constraints if necessary to allow for feasible solutions.
  
  
  
  Optimizer Configuration:
  
  Check the settings of the optimizer in the SAP system. Ensure that the parameters are set correctly for your specific planning scenario.
  If you have made recent changes to the optimizer settings, consider reverting to previous settings to see if that resolves the issue.
  
  
  
  Log Analysis:
  
  Review the optimizer logs for additional details about the error. The logs may provide insights into which specific constraints or data points are causing the issue.
  
  
  
  Testing:
  
  Run smaller test cases or scenarios to isolate the problem. This can help identify specific data or constraints that are causing the optimization to fail.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the optimizer and the specific error message for additional troubleshooting steps or known issues.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who specializes in APO and optimization.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to the optimizer.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  Training and Documentation: Familiarize yourself with the optimization features in SAP APO through training materials or official documentation to better understand how to configure and troubleshoot the optimizer.
  
  By following these steps, you should be able to identify and resolve the underlying cause of the /SAPAPO/PP_OPTIMIZER809 error message.