show Safety Stock Chart in DS planning board

Hi,

we have a requirement wherein we have to show safety Stock as a chart in DS planning board along with Product stock.

i know we have a BADI to add curves or change curve data.

now i have to Derive Safety stock of a planning area in that BADI.

if i do not have a planning book available, is there any other FM/BAPI which gives me Safety stock values in Buckets for a material location combination for a planning area.

Thanks

Gaurav