Lead Time Hierarchy

Many people struggle with how Dynamics AX assigns the lead times for items. This struggle develops because of the many places that lead times can be stored. When the master planning engine calculates delivery dates both Purchased and Production items the system uses a hierarchy moving through the various possible setup fields from the most specific to the most general until it finds a value to use. It starts by looking at the most specific place that a lead time could be found, if it is available it will use it and stop looking. If it is not found it moves on to the next most specific possiblity, until it works through the entire hierarchy. If none is found then lead time will be zero days.

Summary of lead time Hierarchy for from most specific to most general:

Purchased items:

1. Vendor > Accounts payable > Common > Vendors > All vendors > Trade Agreement

Assuming that no default vendor is assigned to the item the system can use the lead time on the vendor trade agreement. Note: the following box must be checked. The Find trade agreements check box must be selected on the Master planning parameters form > Planned orders tab.

2. Default order settings form > Purchase order > tab > Purchase lead time field

3. Site specific order settings form > Purchase order > tab > Purchase lead time field

4. Item coverage form > Lead time tab. If the Purchase check box is selected, the Purchase time field is used.

Production items:

1. Route > Production control > Common > Routes > All routes
2. Coverage group > Master planning > Setup > coverage groups

Production check box, select this check box to override the default production lead time and the default working days for the coverage dimension for the item. This option is used when an item is not associated with a route. “Production time”, Specify the lead time for the production in days.

1. Item coverage > Product information management > Common > Released products > plan > item coverage

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