for E.g.
item 1 has below prices
Dealer price is: 10 Rs
distributer price is : 8 Rs.
Now while creating SO, if i chose a customer who is a dealer/Distributer ten i can give him only 8 Rs as the lowest price. i as a user can not reduce the price less than that.
Let ,me know if you need more information.
I hope you understood.
regards,
Ravi.