How To Fix WT728 - Calculation of next planning period for time-phased planning requirements

SAP Error Message - Details

• Message type: E = Error

• Message class: WT - Retail: Replenishment

• Message number: 728

• Message text: Calculation of next planning period for time-phased planning requirements

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• What is the cause and solution for SAP error message WT728 - Calculation of next planning period for time-phased planning requirements ?

  SAP Error Message:
  
  WT728 - Calculation of next planning period for time-phased planning requirements
  
  Cause:
  The error WT728 occurs during the calculation of the next planning period for time-phased planning requirements in SAP. This typically happens when the system is unable to determine the next valid planning period based on the current settings in the material master or the planning parameters.
  Common causes include:
  
  Incorrect or missing settings in the Planning Calendar or Factory Calendar.
  The Planning Horizon or Planning Period settings are not properly maintained.
  The system cannot find a valid next period because the current period is at the end of the planning horizon.
  Incorrect or inconsistent configuration in the Material Master (MRP views), such as the MRP type, lot size, or planning time fence.
  Issues with the Time-Phased Planning settings, such as the period indicator or period length.
  
  
  Solution:
  To resolve the WT728 error, follow these steps:
  
  
  Check Planning Calendar and Factory Calendar:
  
  Verify that the planning calendar assigned to the plant or MRP area is correctly maintained.
  Ensure that the factory calendar has valid working days and holidays defined.
  Use transaction SCAL to review and maintain calendars.
  
  
  
  Review Planning Horizon and Period Settings:
  
  Check the planning horizon settings in the MRP parameters (transaction MD01, MD02, or MD04).
  Ensure that the planning period length and the number of periods are correctly set.
  Adjust the planning horizon if it is too short or incorrectly defined.
  
  
  
  Material Master Data:
  
  Verify the MRP type and lot size in the material master (transaction MM02).
  Check the MRP views for correct settings related to time-phased planning.
  Ensure that the planning time fence and reorder point are properly maintained.
  
  
  
  Time-Phased Planning Settings:
  
  Check the period indicator and period length in the material master or MRP parameters.
  Make sure the system can calculate the next period based on these settings.
  
  
  
  Run MRP with Correct Parameters:
  
  When running MRP (transaction MD01, MD02), ensure that the planning horizon and other parameters are set correctly.
  Try extending the planning horizon or adjusting the start date.
  
  
  
  Check for OSS Notes:
  
  Search SAP OSS Notes for any known issues related to WT728.
  Apply relevant patches or corrections if available.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  MD01 - Total Planning
  MD02 - Single-Item, Multi-Level Planning
  MD04 - Stock/Requirements List
  MM02 - Change Material Master
  SCAL - Calendar Maintenance
  
  
  
  SAP Tables:
  
  T024E - Purchasing Group
  T001W - Plant Data for Material
  T460A - MRP Types
  T460B - MRP Parameters
  
  
  
  SAP Notes:
  
  Check SAP Service Marketplace for notes related to WT728.
  Example: SAP Note 123456 (hypothetical) might address planning period calculation issues.
  
  
  
  Documentation:
  
  SAP Help Portal on MRP and Time-Phased Planning.
  SAP Library: Production Planning and Detailed Scheduling.
  
  
  
  
  Summary:
  The WT728 error indicates a problem with calculating the next planning period during time-phased planning. It is usually caused by incorrect calendar, planning horizon, or material master settings. Correcting these configurations and ensuring valid planning parameters will resolve the issue.