Basic Dates and Scheduled dates

Hi Team,
  What is the basic intention of having two dates ( Basic dates & Scheduled Dates) in Process/Production Order.
If we reschedule a order in APO PPDS the scheduled Dates in the Process Order ( In ECC) gets changed but not the Basic dates.
Once we Release the order then system carries out the rescheduling of the Order and the Scheduled Dates gets copied to the Basic Dates.
This creates a discrepancy between the dates appearing in MD04 and the dates appearing in Product view of APO PPDS.as MD04 always copies the Basic Dates.
What is the logic behind having this Process......?.
Regards,
Rajesh Satope.

Rajesh,
A simple solution for this could be that in SAP R/3, scheduling parameters for Production orders for the Plant/ordertype combination activate "Automatic Scheduling" and also define "Adjust Basic dates". This means when ever the order is saved it would perform a scheduling and the basic date would get adjusted as per the scheduled dates.
Coming to your query on difference, generally the basic dates in R/3 are derived based on the Inhouse production time defined in the material master of the material Plus the FLOATS defined in the schedule margin key which is assigned to the material MRP view.
Scheduled dates are derived based on the operation time schedule of the order.
Regards,
Prasobh
Edited by: Prasobh Karunakaran on Aug 25, 2009 2:41 PM. Additional information added.

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