The product structure. The time-phased product structure. Level V 0 S W T X (2) U1 1 S Y z U 2 V12) W(1) X(1) Y(1) Z(3) 6 2 3 4 5 Time in weeks The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 1 unit of U. Each unit of T requires 2 units of V, 1 unit of W, and 1 unit of X. Finally, each unit of U requires 1 unit of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, 2 weeks to make Y, and 2 weeks to make Z. Click the icon to view the product structure and the time-phased product structure. In addition to 100 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 gross material requirements plan to reflect this change (type 0 if the input box is not used). Week Lead Time (weeks) Item 1 2 3 4 5 6 7 S Gross req Order release 2 T Gross req Order release 1 U Gross reg Order release 2 V Gross reg Order release 2 w 3 Gross req Order release Gross req Order release 1 Y Gross reg Order release 2 Z Gross reg docroloco