dear sir,
1. create normal payment term and you have to select No default radio button under Default for baseline date. select Installment payment check box under payment terms. (OBB8)
Ex: payment term - 0001
2. create another 3 payment terms i.e. 15days,30days,45days as 0002,0003,0004 respectively.(OBB8).
3. Go to OBB9 screen do the customization as shown below.
4. Go to FB60 screen give the payment term under payment tab.
5. then simulate and post.
Regards,
Prasad.