How To Fix /SAPAPO/PP_OPTIMIZER808 - Starting primal simplex algorithm

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/PP_OPTIMIZER -

• Message number: 808

• Message text: Starting primal simplex algorithm

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/PP_OPTIMIZER808 - Starting primal simplex algorithm ?

  The SAP error message /SAPAPO/PP_OPTIMIZER808 typically indicates an issue related to the optimization process in SAP Advanced Planning and Optimization (APO). This message is often associated with the primal simplex algorithm, which is used for solving linear programming problems in the context of production planning and scheduling.
  Cause:
  
  Data Issues: The error may arise due to incorrect or incomplete master data, such as missing or inconsistent product, location, or resource data.
  Model Configuration: There may be issues with the configuration of the optimization model, such as constraints that are not properly defined or conflicting settings.
  Resource Constraints: If the model has too many constraints or if the constraints are too tight, the optimizer may struggle to find a feasible solution.
  Solver Limitations: The primal simplex algorithm may not be able to find a solution due to the nature of the problem being solved, such as being unbounded or infeasible.
  
  Solution:
  
  Check Master Data: Review the master data for products, resources, and locations to ensure that all necessary information is complete and accurate.
  Review Optimization Model: Examine the configuration of the optimization model, including constraints and settings, to ensure they are correctly defined and do not conflict with each other.
  Relax Constraints: If possible, try relaxing some of the constraints in the optimization model to see if that allows the solver to find a feasible solution.
  Use Alternative Algorithms: If the primal simplex algorithm is not yielding results, consider using other optimization algorithms available in SAP APO, such as the interior point method.
  Check Logs and Traces: Review the logs and traces generated during the optimization run for more detailed error messages or warnings that can provide insights into the specific issue.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes or updates that may address known issues related to this error message.
  
  Related Information:
  
  SAP APO Documentation: Refer to the official SAP documentation for APO and the optimizer for detailed information on configuration and troubleshooting.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Performance Tuning: Consider performance tuning of the optimization model, which may involve adjusting parameters or simplifying the model to improve solver performance.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.