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

In addition to 90 units of S, there is also a demand for 30 units of U, which is a component of S. The 30 units of U are needed for maintenance purposes. These units are needed in week 6. Modify the gross material requirements plan to reflect this change (type 0 if the input box is not used).

		Week							Lead Time
Item		1	2	3	4	5	6	7	(weeks)
S	Gross req	nothing	nothing	nothing	nothing	nothing	nothing	nothing
	Order release	nothing	nothing	nothing	nothing	nothing	nothing	nothing	2

The product structure. The time-phased product structure. Level V 0 S W T T(1) U(1) x 1 S LY U 2 V(2) W(1) X(1) Y(1) Z(2) 1 6 7 2 3 4 5 Time in weeks