Use mathematical forecast with seasonal influence when calculating forecasts for items with variances according to different seasons, i.e. different types of clothing.

The seasonal influence is based on a seasonal curve for the current item group or product group, or a calculated seasonal index based on the alpha or gamma factor entered.

It is possible to enter a manual value or an adjustment on each period. Enter a period in 'Automatic Forecast. Open' (FCS001) and do your adjustments, it is possible to enter a manual forecast at 'Manual Forecast/MDS. Open' (FCS350) as well. The manual entered value will override the calculated value.

In order to use mathematical forecast with seasonal influence, these conditions must be fulfilled:

- In 'Forecast Method. Open' (FCS300), set Seasonal infl to 1.
- In 'Seasonal Curve. Open' (CRS915), define a curve for each year you are going to use it.
- In 'Item Group. Open' (CRS025), specify the seasonal curve to use for each item group.
- In 'Item. Open' (MMS001), specify the Item group for each item to be included in the forecast calculations.

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