Does anyone know why exactly below schedulers are used for?
SCON might be used to schedule PM's, but I have no clue on other two
The APL Scheduler is for the Spare Parts and Reverse Logistics module. SPRL engines like Forward-shipments, Adv. routing, Initiate-return etc. are scheduled using this scheduler.
Some information is available in online help: Winter 16 - Modules
The UDAT scheduler information will be posted shortly.
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I have learned the UDAT scheduler is a legacy scheduler which is no longer used. You can delete it.