In scheduling, the system generates a network structure from the various order structures. This network structure is the same for all order categories. The system lists the operations according to their rank. The start operations (those without predecessors) have the lowest rank. The target operations (those without successors) have the highest rank. All subsequent operations have a higher rank than the operation itself. All operations are scheduled according to their rank.

Starting from the start or finish date of the order, the calculated duration is distributed over the time axis, and the start and finish dates of the operations are calculated. Forward scheduling starts with the order start date. Backward scheduling starts with the order finish date. The operating time or capacity type that you have specified in the work center on the screen Scheduling as a scheduling basis is relevant for scheduling an operation. The operating times that you maintain for the individual capacities of scheduling-relevant capacity are only relevant for scheduling splits.

The system schedules the time intervals between the operations using the relationships. With orders that have no relationships, the system schedules the time intervals using the move time. All time intervals of the relationships are considered as minimum time intervals.

The system can only schedule operations that have a control key indicating that scheduling is intended. Operations not scheduled have the duration 0 and receive as start and finish date the date of the preceding operation (for forward scheduling) or the start date of the following operation (for backward scheduling).

If scheduled dates/times are at work start, work finish or midnight, then the following rules apply:

• Start times are set at the start of work or at 00.00.
• Finish times are set at work finish or 24.00 hours.
• If an operation with duration zero falls on one of these dates, the following special rule applies:
• During forward scheduling, start and finish times are set at the work finish or 24.00.
• During backward scheduling, start and finish times are set at the start of work or 00.00.