How Price Breaks in Blanket Purchase Agreement

Hi everyone,I am new in Oracle Apps .How Price Breaks works in Blanket Purchase Agreement.
If I give default price for line1 5
and in price breaks
I give
Quantity    Price
5               10
10              15
20              18


then
In release
If I am giving
Quantity  in differnet shipment
like 4 6 12 22
how price will be generated automatically
How logic varies in price breaks