Scheduling operations with some of them fixed ?

[former_member353947]

We have a scenario, wherein we scheule operations daily in our scheduliing horizon. Their scheduling is stopped when they enter a freeze period (Schedule changes handled manually).

Now, the user sometimes gets a sales order and wants to fix a schedule for this order by fixing operations of these orders in scheduling horizon. We expect that the system does not change schedule for this order (operations of these orders), but other operations should be scheduled. However, SAP has confirmed that if selected set of operations contain a fixed operation, none of the operation is scheduled when the function / heuristic 'Schedule operations' is used.

Has anybody encounter such a scneario ? Could you share your experiences on this.

Thanks,

Prashant

[Former Member]

Hi,

If I understand you properly, you are trying to freeze a scheduling period, may be first few hours and let the schedulers change it manually.

Did you try the scheduling offset in the strategy of PPDS heuristic?

You can set some time ( this is in minutes) so that the system does not create any orders nor does scheduling.

[former_member353947]

Visu, to further clarify our scenario -

We have 2 horizons. A frozen horizon (7 days starting today) and system scheduling horizon (starting 9th day from today and goes to 28th day). These horizon are managed by 2 time profiles. one for first 7 days, and one for the following 3 weeks.

Scheduling in Frozen horizon is done manually. Scheduling in system schuduling horizon is done by APO system. However, users do want manuall fix some of the opreations in system schedulig horizon. And do not want system to change scheule for these manually fixed operations. If these operations are fixed, system does not schedule any operation in scheduling horizon. We would have expeted that system tries to find slot in backward direction, and if it doe not find a slot, de-allocate that operation.

Thanks,

Prashant

Edited by: Prashant Ghule on Mar 27, 2009 11:12 AM