One unit of A is made of three units of B, one unit of C and two units of D. B is composed of two units of E and one unit of D. C is made of one unit of B and two units of E. E is made of one unit of F. Items B, C, E and F have one week lead times; A and D have lead times of two weeks. Assume that lot for lot (L4L) lot sizing is used for Items A, B, and F; lots of size 50, 50, and 200 are used for Items C, D, and E, respectively. Items C, E, and F have on hand (beginning) inventories of 10, 50, and 150, respectively; all other items have zero beginning inventory. We are scheduled to receive 10 units of A in week 2, 50 units of E in week 1, and also 50 units of F in week 1. There are no order scheduled receipts. If 30 units of A are required in week 8, use the low level coded bill of materials to find the necessary planned order releases for all components.

Note: Simplify data handling to include the receipt of orders that have actually been placed in previous periods, the following six level scheme can be used. (A number of different techniques are used in practice, but the importance issue is to keep track of what is on hand, what is expected to arrive, what is needed, and what size orders should be placed.) One way to calculate the numbers is as follows:

Gross requirements

Scheduled receipts

Projected available balance

Net requirements

Planned order receipt

Planned order release