How To Fix /SAPAPO/SNP422 - Backwards scheduling in period &2 ended due to productn horizn (&1 days)

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/SNP -

• Message number: 422

• Message text: Backwards scheduling in period &2 ended due to productn horizn (&1 days)

Self-Explanatory Message

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• What is the cause and solution for SAP error message /SAPAPO/SNP422 - Backwards scheduling in period &2 ended due to productn horizn (&1 days) ?

  The SAP error message /SAPAPO/SNP422 indicates that backwards scheduling in a specific period has ended due to the production horizon being exceeded. This error typically occurs in the context of Advanced Planning and Optimization (APO) within SAP, particularly in the Supply Network Planning (SNP) module.
  Cause:
  
  Production Horizon Exceeded: The error arises when the scheduling process attempts to schedule production or procurement activities beyond the defined production horizon. The production horizon is a time frame within which planning and scheduling can occur, and it is set in the system configuration.
  Configuration Settings: The production horizon may be set too short for the planning requirements, leading to scheduling issues when trying to plan for periods that fall outside this horizon.
  Planning Parameters: The planning parameters for the product or location may not be aligned with the actual demand or supply requirements, causing the scheduling to extend beyond the allowed limits.
  
  Solution:
  
  
  Adjust Production Horizon: Review and, if necessary, extend the production horizon in the configuration settings. This can be done in the APO system under the relevant planning area settings.
  
  Navigate to the configuration settings for the planning area and adjust the production horizon to accommodate the required planning periods.
  
  
  
  Check Planning Parameters: Ensure that the planning parameters for the product or location are correctly set. This includes checking the lead times, safety stock levels, and any other relevant parameters that may affect scheduling.
  
  
  Review Demand and Supply: Analyze the demand and supply situation to ensure that the planning is realistic and that the production horizon is appropriate for the expected demand.
  
  
  Run Planning Runs: After making adjustments, re-run the planning runs to see if the error persists. Monitor the logs for any further issues.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific details on how to adjust the production horizon and other related settings.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes such as /SAPAPO/SDP94 (for planning book) or /SAPAPO/MC90 (for planning area settings) to access relevant settings.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address known issues.
  User Exits and BAdIs: If custom logic is implemented in your planning process, review any user exits or BAdIs that may affect scheduling behavior.
  
  By addressing the production horizon and ensuring that planning parameters are correctly set, you should be able to resolve the error and allow for successful backwards scheduling in the desired periods.