Detailed Scheduling Activities

Use

The following detailed scheduling activities are used to

Determine dates/times and resources for operations

Define the utilization schedule for resources

Activity	Use
Schedule	For an operation of a newly created order or for a deallocated operation The resources are determined on which the operation should be processed The date/time is determined when the operation should be processed on the resources With scheduling, the operation is dispatched to the resources. Scheduling an order means scheduling all the operations of the order.
Reschedule	A new date/time or new resources are specified for a scheduled operation. With rescheduling, the operation remains loaded on resources. After rescheduling, it loads either the previous resources or the new resources. Rescheduling an order means rescheduling all the operations of the order.
Deallocate	An operation is removed from the resource schedule. With deallocation, an operation is given the status deallocated . The operation no longer loads any resources. Deallocating an order means deallocating all the operations of the order. An operation in the SAP APO system is either scheduledwith no separate statusor deallocated (in this case it has the status deallocated ) .
Adjust	A new date/time or new resources are assigned to a deallocated operation. In the case of an adjustment, the operation retains the status deallocated – that is, the operation does not load the resources to which it is assigned. Adjusting does not change any resources schedules. Adjusting is a detailed scheduling activity that is carried out automatically by the system for dependent objects (for example, if relationships or pegging relationships have to be adhered to). You cannot adjust deallocated operations manually.
Fix	The resource and date/time for the operation is fixed. Through the fixing process, a scheduled or deallocated operation is assigned the status fixed . A fixed scheduled operation cannot be rescheduled or deallocated, and a fixed deallocated operation cannot be scheduled or adjusted.

Prerequisites

You can trigger detailed scheduling activities interactively or they can be automatically triggered by the system; Detailed scheduling activities are generally executed in the background by the system.

Interactively Triggering Detailed Scheduling Activities

You can start detailed scheduling activities specifically for selected operations or orders in the production planning run , on the detailed scheduling planning board , or in the resource planning table. For this purpose, several detailed scheduling functions and detailed scheduling heuristics are available, which carry out one or more detailed scheduling activities according to certain criteria and, if necessary, in a certain sequence. You can also carry out detailed scheduling activities manually on the detailed scheduling planning board and in the resource planning table.

For more information, see solving scheduling problems .

Triggering of Detailed Scheduling Activities by the System

The following table shows some cases in which the system triggers detailed scheduling activities automatically.

Activity	Description
Schedule	The system automatically schedules an order if it triggers a production process model (PPM) or an iPPE process structure Because an order is created in the SAP APO system If the order quantity is changed When an order is rescheduled and the order date is changed in such a way that the PPM or iPPE process structure with which the order was created is no longer valid
Reschedule, adjust, deallocate	If the system schedules objects that have been selected interactively, it also automatically carries out detailed scheduling activities for all the affected dependent operations , so that the schedule remains consistent. For example, it carries out rescheduling or deallocation for scheduled dependent operations, and it adjusts deallocated dependent operations.
Fix	If an operation is scheduled or rescheduled during a non-working time, the system fixes the operation automatically.

Activity

Description

Schedule

The system automatically schedules an order if it triggers a production process model (PPM) or an iPPE process structure

Because an order is created in the SAP APO system

If the order quantity is changed

When an order is rescheduled and the order date is changed in such a way that the PPM or iPPE process structure with which the order was created is no longer valid

Reschedule, adjust, deallocate

If the system schedules objects that have been selected interactively, it also automatically carries out detailed scheduling activities for all the affected dependent operations , so that the schedule remains consistent. For example, it carries out rescheduling or deallocation for scheduled dependent operations, and it adjusts deallocated dependent operations.

Fix

If an operation is scheduled or rescheduled during a non-working time, the system fixes the operation automatically.

Operations That Cannot Be Changed Or Can Only Be Changed with Restrictions

If an operation has one of the following statuses, you or the system cannot make changes to the resources and dates/times of the operation, can make only limited changes.

Status of the Operation	What You Can Do
Finally confirmed	No change can be made. The operation has already been carried out and is therefore no longer subject to scheduling.
Started or partially confirmed	The operation is in process. You can only reschedule the remaining capacity requirements for operations after you have interrupted the operations on the detailed scheduling planning board.
Fixed	So that the dates and resources for fixed operations can be changed again, you must undo the fixing for this operation on the detailed scheduling planning board, in the resource planning table, or in the production planning run. You can fix operations on the detailed scheduling planning board, the resource planning table, or in the production planning run. The system automatically fixes operations that are scheduled in non-working times .

Status of the Operation

What You Can Do

Finally confirmed

No change can be made. The operation has already been carried out and is therefore no longer subject to scheduling.

Started or partially confirmed

The operation is in process.

You can only reschedule the remaining capacity requirements for operations after you have interrupted the operations on the detailed scheduling planning board.

Fixed

So that the dates and resources for fixed operations can be changed again, you must undo the fixing for this operation on the detailed scheduling planning board, in the resource planning table, or in the production planning run.

You can fix operations on the detailed scheduling planning board, the resource planning table, or in the production planning run. The system automatically fixes operations that are scheduled in non-working times .