Safety stock calculation

Hi all,
1. How the system calculates the Safety stock requirement for the raw materials?
Requirement is,
I am doing monthly production planning for the FG materials. And i want to keep all the raw materials stock as 15, 30 and 45 days stock as safety stock of the respective FG BOM raw materials. Bu the safety stock requirement for the each raw material is different.
How to get the safety stock requirement quantity for the required raw materials?
Actually I tried with coverage profile and the safety time / range of coverage in the MRP 2. But I did not any results. i think  I may be wrong ,when I am working with coverage profile and safety time / range of coverage.
Please suggest me the appropriate solution for the above requirement.
Example,
Month     April
FG Material (XYZ)     1000
BOM for ‘XYZ’
Component     Qty     stock
RM1     2     100
RM2     1     150
RM3     1.5     500
As per the BOM the actually requirement for the RM1, 2, 3 are 1900, 850 and 1000 respectively.
I want to maintain the safety stock of the raw materials for RM1 for 15 days, RM 2 for 30days and RM3 for 45 days stock based on the gross requirement qty. So my total requirement as per the safety stock requirements is as below said, for the raw materials like,
RM1 is 2000(gross requirement qty) +1000 (safety stock requirement for 15 days) -100 (available stock) =2900
RM2 is 1000(gross requirement qty) +1000 (safety stock requirement for 30 days) -150 (available stock) =1850
RM3 is 1500(gross requirement qty) +2250 (safety stock requirement for 45 days) -500 (available stock) =3250
How to get the above explained requirement quantities for the raw materials like RM1,2,3.
regards
Srinivas

You should be able to achive this using the Coverage Profile..
Reg
Dsk

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