how to approach this? Change the value of unit price in the Sales line on changing its size, As far as I know the default unit price comes from trade agreements. In this case there would be no size, but for my requirement I should assign value from trade agreements for sizes 1,2,3,4 and for 5 and 6 the the value from trade agreements should be incremented with 1. i.e how to approach this? Change the value of unit