Modify the net material requirements plan

Question

Discuss the below:

Q: The demand for subassembly S is 140 units in week 7. Each unit of S requires 2 units of T and 1 unit of U. Each unit of T requires 1 unit of V, 1 unit of W, and 1 unit of X. Finally, each unit of U requires 1 of Y and 2 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1week to make X, 2 weeks to make Y, and1 week to make Z.

Suppose that in addition to 140 units of S, there is also a demand for 20 units of U, which is a component of S. The 20 units of U are needed for maintenance purposes. These units are needed in week 6. Modify the net material requirements plan to reflect this change.

Item	On-Hand Inventory	Item	On-Hand Inventory
S	20	W	30
T	20	X	30
U	30	Y	40
V	20	Z	180

Item					Week									Lead Time
					1	2	3	4	5			6	7	(weeks)
S	Gross req												140	2
	On hand												20
	Net req												120
	Order receipt												120
	Order release								120
T	Gross req									240	1
	On hand									20
	Net req									220
	Order receipt
	Order release				220220

U	Gross req								2
	On hand
	Net req
	Order receipt
	Order release