Automatic reorder point and safety stock caluclation- MRP type:V2

Hi,
I want the system to calculate reorder point and safety stock. To simulate this i created one material with
MRP type:V2, service level as 97%, Forecast model:D,Hist. period:12,Forecast periods:12, and I entered
the historical value for past 12 months as 100 nos in material master.
04.2009     100
03.2009     100
02.2009     100
01.2009     100
12.2008     100
11.2008     100
10.2008     100
09.2008     100
08.2008     100
07.2008     100
06.2008     100                 
05.2008      100                
Then I went to MP30 and executed the forcase.When I checkd the material master the system has calculated the reorder point as 14 nos. But there is no value updated in safety stock field.
Now I have two questions.
1) How the system has arrived the reorder point value as 14 nos.
2) Why there is no safety stock updated in material master.
Could u please clarify this.
Thanks and Regards
Purushothaman

Hi,
This is further to my preivous mail. I have changed the consumption values and now i am getting the safety stock.
MRP type:V2, service level as 97%, Forecast model:D,Hist. period:12,Forecast periods:12, and I entered
the historical value for past 12 months as.
04.2009     100
03.2009     80
02.2009     110
01.2009     85
12.2008     90
11.2008     95
10.2008     125
09.2008     90
08.2008     90
07.2008     92
06.2008     101
05.2008     100
After executing the forecase the sytem has calculated the below parameter.
Basic value:95.759
MAD:11.448
Safety stock:10.252
Reorder point:23.658.
Can anyone explain me how these calculation arrived.
Thanks and regards
Purushothaman

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