MIGO exit/ BADI for number range

Hi All,

When I am doing MIGO, then I want that after posting, a particular document no should be genrated which is wrt particular PO Number range.

For example, One PO No range is from, lets say, 1000 to 1999, then Doc no generated is, lets say 100 to 199,

and if PO no range is 2000 to 2999 then Doc no generated should be from 200 to 299.

So is there any BADI or user exit for the same or is there any other way of doing the same.

Please guide me.

Vinod.