Seasonal + Trend forecast calculation

all,
We are using Consumption based planning with MRP type VV and Forecast model - X and material master maintained as below.
For testing purpose, I have maintained past consumption for last 6 month as below screen shots.
When I execute forecast from Material master tab, I got basic values, MAD, safety stock & error total as below..
How System is calculating above values?. I have gone through the formula but didn't understood and also gone through below link but didn't get sna idea.
http://http://scn.sap.com/community/erp/post!input.jspa?containerType=14&container=2110&content Type
And How System calculate below corrected forecast values?
Please help to understand calculation.

Hello Mr,
Please check below link for seasonal trend calculation formula, Insert values and try to cross check result.
I hope this link helpful to you.
Forecast with Seasonal Trend Model - Forecasting - SAP Library
https://help.sap.com/saphelp_scm70/helpdata/en/46/a605b9d57052b8e10000000a155369/content.htm
Thanks & Regards
Umesh Mali

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*http://help.sap.com/saphelp_scm70/helpdata/en/19/98ad1765354d7ba54b1eb164c377e0/frameset.htm
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*http://help.sap.com/saphelp_scm70/helpdata/en/19/98ad1765354d7ba54b1eb164c377e0/frameset.htm
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