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PS Scheduling with subnetworks (PM orders)

Hello all,

I am currently working on a project where I am helping a client use Project systems to manange a plant shutdown. The requiment is to schedule the many maintanance orders (300 +) using project systems to see the critical path and the to manage capacity of the work centers to fit into the time box for the shutdown. I have set up a project down to the network activity level representing the high level process and have started linking PM orders through the additional data b tab, but I have a couple questions.

1.) When you create the link on the additional data B tab. You get a pop up box that will automaticly derive the Project definition and WBS element. Should you link it to all through or should you only select one of the PS objects. What purpose does it serve to show all three or just one PS object?

2.) In terms of scheduling when i attach a PM order to a network and activity it will adapt the basic date of the network activity, however it does not change the day of the network activity to be the same period of the orders attached. I am using buttom up scheduling on the network. Example. I have a network activity with a basic date and duration of 1 day. If I attach a PM order which would require 3 days to complete the network still shows only 1 day. When I reschedule the project should it change the dates on the parent objects? i can see the changed dates when I run a CN41 structure report, but if I look in planning board without the PM orders I don't see the true duration.

Any help would be appreciated on this subject. I am not a PM person. Not sure if this is an issue with a control key.

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