SAP What is # 8 - What is Backward Overlap ?

SAP What is # 7 dealt with Forward Overlap concept, this one is on Backward Overlap.

Assuming Lot size "ZB" with with '-' for Backward overlap as below.

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And the material master is fine tuned with the following as below:

1) max lot size of 100

2) takt time of 1

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The results of
MRP run on a Planned Independent Requirement of 550 as below:
1) The maximum lot size of 100 only allow planned order of max size 100.
2) Takt time 1 backward each planned order from the requirement date.

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Here is the factory calender:
And the factory calender is adhered to.

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CONCLUSION: Similar to the Forward Overlap parameter, the Backward Overlap parameter is just the opposite.

APPLICATION: In this case, coupled with the maximum lot size parameter, the backward overlap impose a strict delivery quantity requirement based on the cycle time / takt times. At the same time respecting the factory calender. This is useful to staggered the delivery for production consumption due to space in the warehouse.

CAUTION: Consider the use of combining these fine-tuning parameters by creating a new lot-size key. Test them thoroughly before use.
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