For an item of a scheduling agreement, you can define the following zones:
Firm zone (production go-ahead period)
The firm zone defines the point in time at which the production go-ahead period ends. The production go-ahead period begins with the current date. The schedule lines falling within this zone or period are fixed, and can thus be regarded as equivalent to firm orders. The production go-ahead period should be defined in consultation with the supplier and generally comprises the time that the supplier needs to produce the scheduled quantities.
Trade-off zone (material go-ahead period)
The trade-off zone defines the point in time at which the material go-ahead period ends. The material go-ahead period begins with the end of the production go-ahead period and encompasses both. Delivery schedule lines falling within this period can be less binding in nature than those in the firm zone. The material go-ahead period is generally based on the delivery time or production time of the components that the supplier needs to manufacture the ordered materials.
Both the production and the material go-ahead period are printed in the schedule lines and transmitted with them. The firm and trade-off zones are both calculated in calendar days. You enter these zones in the additional data for the relevant scheduling agreement. You also make the settings for the automatic fixing (firming) of schedule lines in MRP there.
Binding on MRP
You can define which delivery schedule lines can be changed by the system during an MRP run. The possible settings are as follows:
Only schedule lines after the trade-off-zone
Only schedule lines after the firm-zone
All schedule lines
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