Formula or Methodology used for Seasonal & Linear Regression Forecast Model

Hi all,
I am using the Forecast Model 35 (Seasonal & Linear Regression Model) for Statistical Forecast generation.
Now I am facing the Issue that my Model 35 is consistently Under Forecasting.
Can anyone let me know what Formula or Logic is used by the Model to generate the Statistical Forecast.What are the Parameters that can really improve the Under Forecasting trend for Model 35.
kindly help...
Thanks & Regards,
Vishal.S.Pandya.

Couple of quick checks that you should do
1. Make sure there is no Like Profile active for that planning object that is interfering
2. Do a Strategy 56 to test for season and trend. See if streatgy 56 indeed recommends regression model
3. If strategy 56 fails for season or trend, and you enforce seasonal or linear regression model - i would expect to see the behaviour you are seeing
4. Make sure there are adequate time buckets for forecast initialization
5. Make sure the forecast initialization buckets are representative of the forecasts and are not outliers
IN this regard do check
http://help.sap.com/saphelp_scm50/helpdata/en/19/06f74ee2ed11d3b78d0000e82debc6/content.htm
http://help.sap.com/saphelp_scm50/helpdata/en/96/d261f8e39011d3b78e0000e82debc6/content.htm

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