Consumption-based (stochastic) planning.
If the lot size relates to weeks and the forecast period to months,
purchase requisitions to the amount of the forecasted monthly
requirements are created. Because of the weekly lot size, however,
you might expect that a planned order/purchase requisition to the
amount of the expected weekly requirements will be created.
A forecast based on the period "month" calculates monthly requirements.
Fronm the point of view of the system, these fall on the first workday
of the month and are scheduled by requirements planning for this date.
The weekly lot size groups together all requirements in the relevant
week, including the (monthly) requirements created by the forecast;
however, it does not divide up the latter into weekly quantities.
The procedure described above is not an error.
The desired function (monthly forecast but weekly lot size) is
implemented by breaking down the monthly forecast into weekly
requirements. In order for this to happen, the user must set the
splitting indicator on the second MRP screen of the material master
record. (Please see also Chapter 7 of the manual "Forecast-Based
Planning".)
Key word: Lot size period
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