HANA Decision table per year

Hi,

i created a decision table for my requirement, which classify sales-revenue per customer. I have time Characteristic on input Table (Calmonth, year etc.) My problem is, i would like to classify customer revenue always one year ( Current Month - 12 Month) and later on put on composite Provider BW4/HANA. Can i use fix-filter (current month - 12 month)?or any another solution?

Thanks for ur help

Sascha