Is it OK to delivery demands early?

[ushnisha]

In the current logic, if a Task is planned earlier (due to holiday constraints, for example) it is possible for the downstream tasks to be pulled ahead and the demand is satisfied earlier.

Need to add logic to let the users define if it is ok to delivery the demand early or delivery JIT. We also need to decide that if only the final delivery/shipment task must be planned JIT or if all tasks must be planned JIT. That is, where should the inventory be held?!

Need to think about this more. We don't want too many flags/user controls either at this time as it may complicate the solution too early.