How is delivery date calculated

How can anyone please explain how delivery date is calculated using forward and backward scheduling
I want to have it broken down into the following steps
for eg for delivery date calculation following dates are used
Material Availabilty Date
Material Staging Date
Pick/pack time
Transportation PLanning date
Loading date
Goods issue date
Transit Date
Delivery Date
Can some one please give me an example and explain wht these dates are
for eg customer needs delivery date on 11/20/2008
how would the system cacluate whether it can meet the delivery date using backward scheduling
and if it doesnt meet how does the system do the forward scheduling
also i am not clear with the following dates
material avaialibilty date
material staging date
transportation date
can some one please explain me all this in detail
Also i have another question at the sales order creation when is shipping point and route determined
coz based on the ATP check only material avaialabilty date is determined and if we have a bacjground job running every 1 hours for atp then immediately when we create a sales order is a route and shipping point determined (just before we save the sales order)
Let me be more clear
Suppose customer representative recevies a order on the phone
he enters sold to party, ship to party ,PO number,delivery date and material number and then hits enter
so at tht time the shipping point and route is determined ?
also when an atp check runs and if the delivery date is not met then the system will propose a new delivery date but if we have a different route configured say for eg overnight so we can meet the delivery date and we want to change this route to overnight what must we do?
should we change the shipping condition in the header?
I am not very sure about the process can you please also explain me this in detail?
Thanks

Hi there,
When a sales order is logged & the user enters the requested delivery date, system 1st does the backward scheduling date. Pla note that the factory calender mentioned in the shipping point & route plays a crutial role in defining the working days & confirmed delivery date.
For eg: Customer has raised an order on 11/15 & requests delivery on 11/20/2008.
the following times are important in delivery scheduling.
Transit time: maintained in route
Loading time maintained in the shipping point
Transportation planing time maintained in the transportation planning point.
pick pack time maintained in the shipping point.
Material availability time maintained in MM02 --> MRP screens. This is the time that the material can be manufactured (for inhouse producted items) or external processing time (for externallly procured materials like TAS items).
From the requested delivery date 11/20 system does the backward scheduling & determines the following dates:
Goods issue date, loading date, pick pack date, transportation planning date & material availability date.
Time between:
goods issue date - reqested delivery date: transit time
Goods issue date - loading date: loading time
transportation planning date - pick pack date: picking pack time
Material availability date - transportation date: transportation planning time.
Consider that the factory calender has all days of the week as working dates (to make it simple to explain). Also transit time is 3 days, loading time is 1 day,pick pack time is 1 day, material availability time is 3 days.
From 11/20 ussing backward scheduling system determines the following dates:
Goods issue date: 11/17
Loading date: 11/16
Pick pack date: 11/15
System will check if material is available on the 11/15 to start pick / pack. If it is available then system will confirm the reqested delivery date. Else it will check when the material is available. For eg basing on the MRP settings mnaterial is available only on 11/18. So from 18th system does forward scheduling & redetermines all the dates. So pick / pack date is 11/18. Loading date is 11/19, goods issue date is 11/20 & possible delivery date is 11/23. So system will confirm the delivery date on 11/23. This is when complete delivery is required. If partial delivery is allowed, then system will check how much quantity is available on 11/15. Accordingly it will give 2 delivery dates.
In the above example include teh factory calender which will have 5 day week with Fri & Sat as holidays. Accordingly dates will change.
Here replenishment lead time also plays an imp role. Pls refer http://help.sap.com/erp2005_ehp_03/helpdata/EN/6b/2785347860ea35e10000009b38f83b/frameset.htm for further information
Regards,
Sivanand

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Explain How delivery date is calculated using backward and forward schedul

How can anyone please explain how delivery date is calculated using forward and backward scheduling
I want to have it broken down into the following steps
for eg for delivery date calculation following dates are used
Material Availabilty Date
Material Staging Date
Pick/pack time
Transportation PLanning date
Loading date
Goods issue date
Transit Date
Delivery Date
Can some one please give me an example and explain wht these dates are
for eg customer needs delivery date on 11/20/2008
how would the system cacluate whether it can meet the delivery date using backward scheduling
and if it doesnt meet how does the system do the forward scheduling
also i am not clear with the following dates
material avaialibilty date
material staging date
transportation date
can some one please explain me all this in detail
Thanks

Hi,
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If material is not available then system takes into consideration vendor delivery date & then calculate customer ship date.
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We are not able to calculate the delivery date in Sales Orders based on the Route transit time.We are using the Transportation group from Material master , Shipping condition from sold to Party , and Receiving issuing plants and zones .
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Please advise.
Thanks in advance

Hi,
Kindly do not post same questions twice
HI,
For delivery scheduling enter time
IMG >> SD >> Basic functions >> delivery scheduling and transportation >> maintain duration
Maintain here route, pick/pack & loading time
For in house production maintain time in material master in MRP view
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Dear Experts,
The purpose here is to consolidate all deliveries on one day.
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