Capacity Constraints in PPDS

[Former Member]

Hi All.

Business Process

We're using multi-level BOM. So, to produce a finished goods, we might have several Planned Orders created.

Sample BOM as below:

FG A

.1 SFG B

..2 SFG C

..3 SFG D

Based on the Multilevel BOM above, 4 Planned Orders will be created:

FG A (Planned Order A) - Operation Z

.1 SFG B (Planned Order B) - Operation Y

..2 SFG C (Planned Order C) - Operation X

..3 SFG D (Planned Order D) - Operation W

When we perform detailed scheduling run using standard SAP heuristics Enhanced Backward Scheduling, follow by Stable Forward Scheduling), the APO will schedule the Planned Order A, B, C & D back to back.

By using the sample given above, APO scheduling result as below:

Planned Order Start Date End Date

Planned Order D 15.04.2011 (8:00) 16.04.2011 (8:00)

Planned Order C 16.04.2011 (8:00) 17.04.2011 (10:00)

Planned Order B 17.04.2011 (10:00) 18.04.2011 (8:00)

Planned Order A 18.04.2011 (8:00) 19.04.2011 (7:00)

Our business requirement says we need to overlap the orders, as we need not wait for all the operation to complete.

Since Std PPDS does not support overlapping, we have created an enhancement which forcicbly changes the planned orders dates to overlap.

After running our enhancement, we find that the below orders are overlapped:

Planned Order D 15.04.2011 (8:00) 16.04.2011 (8:00)

Planned Order C 16.04.2011 (1:00) 17.04.2011 (3:00)

Planned Order B 17.04.2011 (3:00) 18.04.2011 (3:00)

Planned Order A 18.04.2011 (3:00) 19.04.2011 (3:00)

But the question we are having is when Planned order C is getting overlapped on the resouce, it might as well clash with other orders running that resouce, due to which resource may get overloaded.

THereby can you suggest us any alternative to see to that capacity constraints are addressed on that resource???

Is ther an alternative by executing a custom/std heurtiscs for PPDS capacity levelling?

Regards,

S.Manjunath

[Former Member]

Hi Manjunath,

Hope you explored all the options like Continuous production before going for enhancement. Maybe continuous production didnot met your exact requirement.

You must have derived dates of planned order of C according to your requirement in your enhancement. While scheduling planned order for C with new start or finish date use some finite scheduling mode like find slot or insert operation.

Regards

Santosh