MRP Example TwoA master schedule calls for 250 units of A in week 6, 140 in week 8 & 200 in week 9. On-hand levels are A = 5, B = 5, C = 0, D = 0 & E = 5. Another 5 units of D are scheduled to be received in week 1 and 5 units of E in week 2. Order quantities are lot-for-lot for A and C, multiples of 10 for B & E & a minimum of 150 for D.

A

C(1)

D(2)

B(1)

D(1) E(1)E(2)

C(1)

D(1) E(1)

Low Level Coded Product Structure Tree

Part/Sub-component BeginningAvailable

ScheduledReceipts

Lead Time SafetyStock

Lot Size

A 5 0 1 week 0 L4LB 5 0 1 week 5 10'sC 0 0 2 weeks 0 L4LD 0 5 in week 1 1 week 0 150 min.E 5 5 in week 2 1 week 0 10's

LT = 1 Q = L4L 1 2 3 4 5 6 7 8 9 10 Gross Req. 250 140 200 Scheduled Rec. On-Hand 5 5 5 5 5 5 5 0 0 0 0

Net Requirements 245 140 200 Planned Ord. Rec. 245 140 200 Planned Ord. Rel. 245 140 200

Product A Solution

LT = 1 Q = multiples 10 1 2 3 4 5 6 7 8 9 10

Gross Req. 245 140 200

Scheduled Rec.

On-Hand 5 – 5 = 0

0 0 0 0 0 5 5 5 5 5

Net Requirements 245 135 195

Planned Ord. Rec. 250 140 200

Planned Ord. Rel. 250 140 200

Component B Solution

LT = 2 Q = L4L 1 2 3 4 5 6 7 8 9 10

Gross Req. 250

245 140 340 200

Scheduled Rec.

On-Hand 0 0 0 0 0 0 0 0 0 0 0

Net Requirements 250 245 140 340 200

Planned Ord. Rec. 250 245 140 340 200

Planned Ord. Rel. 250 245 140 340 200

Component C Solution

LT = 1 Q = min of 150

1 2 3 4 5 6 7 8 9 10

Gross Req. 250 245 140 830 200 280 400

Scheduled Rec. 5

On-Hand 0 0 5 0 0 10 0 0 0 0 0

Net Requirements 245 245 140 820 200 280 400

Planned Ord. Rec. 245 245 150 820 200 280 400

Planned Ord. Rel. 245 245 150 820 200 280 400

Component D Solution

LT = 1 Q = batches of 10

1 2 3 4 5 6 7 8 9 10

Gross Req. 250 245 640 340 480 400

Scheduled Rec. 5

On-Hand 5 5 5 0 5 5 5 5 5 5 5

Net Requirements 240 245 635 335 475 395

Planned Ord. Rec. 240 250 640 340 480 400

Planned Ord. Rel. 240 250 640 340 480 400

Component E Solution