Fixing Operations, Orders, and Time Intervals 

Use

If you do not wish to make any more changes to the dates and resource assignment for an operation or order, or if you do not wish to make any further changes to the resource schedule for a specific time segment, you can fix the operation, order or (for certain time intervals) the resource.

·        Fixing operations or orders

This function is available on the detailed scheduling planning board or in the production planning run. A fixed scheduled operation cannot be rescheduled or deallocated, and a fixed deallocated operation cannot be scheduled or adjusted (see detailed scheduling activities). By fixing an order, you fix all operations in that order. Through fixing, the operation or order is given the following status:

¡        An operation is given the status Fixed.

¡        An order that contains at least one fixed operation is given the status date fixed and PP firmed (that is, the order is also fixed for Production Planning (PP)).

If you called up the DS planning board using a standard planning board profile, fixed objects are indicated by a red bar.

·        Defining fixing intervals for resources

You fix resources by interval. You cannot change the schedule in a fixing interval. This means:

¡        Operations that lie completely or partially within a fixing interval are fixed

¡        You cannot schedule or reschedule operations in fixing intervals

You use a planning interval to define a period in which the resource can be scheduled. Outside the planning interval, the resource is fixed.

Fixing intervals are shown as red in the resource chart; the operations and associated orders contained in the chart are not marked as fixed, however.

This function is only available on the detailed scheduling planning board.

Integration

If you have fixed an operation or order on the DS planning board, the associated order acquires the status date fixed and PP firmed.

An operation or order with the status date fixed (and thus also PP firmed) is fixed for detailed scheduling and production planning. If you reset the fixing on the planning board, the date fixed status is reset. If the corresponding order also has the status output firmed or input firmed, the PP firming is retained.

An operation that lies within a fixing interval of a resource is fixed only for detailed scheduling. In this case, neither the Fixed indicator in the operation nor the Date Fixed indicator in the order is set. This operation is not protected from changes that production planning may make (for example, in the MRP run).

The system also takes the fixing of operations and orders, as well as fixing intervals, into account during the optimization process.

Activities

Fixing and unfixing orders and operations on the DS planning board

To fix individual operations and orders, select the objects and choose Functions → Fix.If you perform this function for a selected activity, the system fixes the entire associated operation.

To undo the fixing, select the fixed objects and choose Functions → Undo Fixing.

Fixing and unfixing objects in the production planning run

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       1.      Choose the function Fix Object or Unfix Object for the processing step in the production planning run in which objects are to be fixed or unfixed.

       2.      Enter the objects that are to be fixed or unfixed.

You cannot change the scheduling for objects outside the propagation range. You cannot undo this “fixing”.

Process fixing intervals for resources starting from the detailed scheduling planning board

To create, change, or delete fixing intervals for resources, select the resources and choose Goto → Fixing Intervals. In the dialog box Define Fixing Intervals and Planning Intervals, you can create or delete fixing or planning intervals for the selected resources. In the Extended View, you can process the list of all existing fixing intervals for each selected resource.

Process fixing intervals with heuristic

You can also create, replace, or delete fixing intervals using the heuristic SAP_DS_03. In addition, you can specify in the heuristic settings that the operations lying within the fixing interval that is to be created are to be fixed when the heuristic is executed. As a result, the operations are protected not only from changes due to the detailed scheduling but also from possible changes made in an MRP run. After execution of the heuristic, the order has the status Date Fixed and PP-Firmed.