The make-to-stock strategy gross requirements planning is particularly useful in mass production environments; it is often combined with repetitive manufacturing. This strategy is particularly useful if you need to produce, regardless of whether you have stock or not. For instance, steel or cement producers might want to use this strategy because they cannot shut down production; a blast furnace or a cement factory must continue to produce, even if this means having to produce to stock.
This strategy is also frequently used if there is a
Material Requirements Planning
system in a legacy system that needs to be linked to an SAP system which serves as a production execution system. The legacy system calculates a specific production plan, which has to be executed, regardless of the stock situation in the SAP system.
Examples from Industry
Heavy-duty industries such as steel manufacturing (blast furnace) and the cement industry.
You need to maintain the following master data for the finished product:
Maintain strategy group
11
on the
MRP
screen.
Set the
Mixed MRP
indicator to
2
on the
MRP
screen.
Maintain the item category group (for example,
NORM
) on the
Sales Organization
screen.
Maintain the
Availability check
field so that you perform an availability check
without
the replenishment lead time (checking group
02
in the standard system). For more details, see the
Other Areas
section in
Production by Lot Size (30)
.
For a detailed example of the entire process, see Sample Scenario: Strategy 11 .
This planning strategy is to some extent similar to Net Requirements Planning (10) . However, the following differences exist:
Strategy |
10 |
11 |
Stock is taken into account |
Yes |
No |
Reduction of planned independent requirements takes place during … |
… goods issue for the delivery |
... goods receipt for a production order (discrete production), for a planned order (repetitive manufacturing), or for a purchase order (trading goods). |
Gross requirements planning also has the following features in common with net requirements planning (10):
Production quantities can be planned relatively effectively by means of planned independent requirements. It is possible to use information from the Sales Information System, flexible planning, or other planning tools to plan production quantities. This means that production and procurement of the required components is triggered before the sales order stage.
Individual sales orders, which can be somewhat irregular, do not affect production.
An accurate availability check is performed according to ATP logic during sales order processing.
It is possible to perform a lot size "optimization" during planning so that you always plan convenient lot sizes in Demand Management or during the MRP run using lot size and/or rounding keys.
Availability Check
You must work with an availability check that checks without checking the replenishment lead time. See Availability Check .