How To Fix WT105 - Forecast weighting factors have already been created

SAP Error Message - Details

• Message type: E = Error

• Message class: WT - Retail: Replenishment

• Message number: 105

• Message text: Forecast weighting factors have already been created

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• What is the cause and solution for SAP error message WT105 - Forecast weighting factors have already been created ?

  Certainly! Here's a detailed explanation regarding the SAP error message WT105: Forecast weighting factors have already been created:
  
  SAP Error Message: WT105
  Text: Forecast weighting factors have already been created
  
  Cause:
  This error occurs when you attempt to create forecast weighting factors for a material or planning object, but weighting factors already exist for the specified combination of parameters (such as plant, material, forecast profile, or planning version). SAP prevents duplicate entries to maintain data consistency.
  In other words, the system detects that the forecast weighting factors you are trying to create are already present in the system, so it does not allow creating them again.
  
  When does it occur?
  
  During the creation or maintenance of forecast weighting factors in transaction MC87 (or related forecasting transactions).
  When trying to generate or upload weighting factors for a material and plant combination that already has weighting factors assigned.
  When running forecast profile setup or during planning version maintenance if weighting factors are involved.
  
  
  Solution:
  
  
  Check Existing Weighting Factors:
  
  Use transaction MC87 to display existing forecast weighting factors.
  Verify if weighting factors already exist for the material, plant, and forecast profile combination.
  
  
  
  Modify Instead of Create:
  
  If weighting factors exist and you want to change them, use the change or display mode instead of creating new ones.
  Update the existing weighting factors as needed.
  
  
  
  Delete Existing Weighting Factors (if appropriate):
  
  If the existing weighting factors are incorrect or obsolete, you may delete them first before creating new ones.
  Deletion can be done via MC87 or relevant transaction, depending on your SAP version and setup.
  Caution: Deleting weighting factors may impact forecasting results, so ensure this is done with proper authorization and understanding.
  
  
  
  Check Forecast Profile and Planning Version:
  
  Ensure you are working with the correct forecast profile and planning version.
  Sometimes, weighting factors are maintained per planning version; creating them in a different version may be necessary.
  
  
  
  Consult SAP Notes / Documentation:
  
  Review SAP Notes related to forecasting and weighting factors for any known issues or patches.
  For example, SAP Note 123456 (example) might provide additional guidance.
  
  
  
  
  Related Information:
  
  Transaction MC87: Used to maintain forecast weighting factors.
  Forecast Weighting Factors: These are used in statistical forecasting to assign different weights to historical data points, influencing the forecast calculation.
  Forecast Profiles: Define the method and parameters for forecasting.
  Planning Versions: Different versions of planning data can have separate weighting factors.
  SAP APO / IBP: In advanced planning systems, weighting factors might be handled differently.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WT105: Forecast weighting factors have already been created
  
  
  Cause
  Attempt to create weighting factors that already exist for the given parameters
  
  
  Solution
  Check existing weighting factors, modify or delete them before creating new ones
  
  
  Transaction
  MC87 (Maintain Forecast Weighting Factors)
  
  
  Impact
  Prevents duplicate weighting factors, ensures data consistency in forecasting
  
  
  
  
  If you need help with specific steps in MC87 or further troubleshooting, please provide details about your SAP system version and the exact process you are following.