Sameer,
if I use strategy 40, then I will be producing my product B to stock..business doesnot want to do that.. they want to wait till a real demand come and then they want to produce the finished product B.
so a firm demand can be
1. SO from outside customer
2. STO from plant 1000
by using strtagey 50, I am satisfying point 1 above. but not 2..