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Use

If a production order contains a component that is manufactured using a second production order (direct production), the requirements date for this component serves as the order finish date for the second order. If the second production order again contains a component that is manufactured using a third production order, the requirements date for this component serves once again as the order finish date for the third order, and so on.

When you are scheduling a subtree or a complete collective order, you enter framework dates in the order that is on the top level. These framework dates serve as a guideline. They mark out the period within which the system tries to schedule the current order and all the subordinate orders.

Collective orders are normally scheduled backwards. Therefore, if you have entered an framework finish date in the top order of a collective order, the system goes backwards from this date and schedules each order backwards, starting with the requirements date for the component, that is produced in the order. The order start date for the earliest production order is identical to the framework start date for the collective order.

The following graphic contains an example of backwards scheduling in the collective order (without Taking Into Account Move Time):

This graphic is explained in the accompanying text

Features

Dates Proposed Manually in a Collective Order

Framework dates serve as guidelines for scheduling the collective order: When scheduling a subtree or a complete collective order, you must propose at least one framework date according to the scheduling type:

The system tries to complete the current order and all dependent orders before this date.

The system schedules the current order and all dependent orders after this date.

The system tries to schedule the current order and all dependent orders within the specified time period. On scheduling, if it is established that the framework dates cannot be kept to, then the system uses reduction measures to try to shorten the lead time of the scheduled orders.

If an order’s start date is in the past, the system switches to Today Scheduling. In this case, you receive an appropriate warning message in the scheduling log.

Note

You can propose framework dates on various levels in a collective order. Note, however, that every proposal of a framework date represents a fixed schedule for the corresponding sub-tree. This may lead to the situation in which the dates of individual orders in the collective order are no longer coordinated.

Calculated Dates in a Collective Order

Collective order scheduling calculates the dates for the individual orders (basic dates and scheduled dates) and the scheduled dates for the collective order.

The result of lead time scheduling has the following effect on the collective order dates:

Scheduling Individual Orders in a Collective Order

When you schedule an individual order, proceed as for scheduling a normal production order.

Scheduling Subtrees or Whole Collective Orders

When you schedule more than one order at the same time

Note

Framework dates are only then written to an order, if they are entered manually.

Note

If an order deadline that is determined in a scheduling run comes after the requirements date for the components to be produced, the scheduling log informs the user about it. If the user saves the orders despite this warning, then a system status is set in the corresponding order.

 

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