Why schedule line category must needed

Question

Hello Experts,
I gone through several threads in the forum but still confused.
I got the info like...
It confirms the
1. confirmed date of delivery
2. confirmed quantity of del
3. Availability check
4. Transfer of requirement
a.purchase requisition type
b. delivery block
c. movment type of goods
The Schedule line contains the delivery date and quanitity in a slaes document item. This is only a one line explanation for your understanding purpose only.Tcode VOV6.
Now please kindly explain me with an example without slc what will not happen.
one Item can have many schedule lines . Why we need many SLC for one item please tell me with example.
Thanks in advance for all the replies

Answer 1

Hi,
If you take a sales order document, it is divided into three parts:
Header Level information :
This consist of the overall information of the sales document, for example Net value of the sales order and the like.
Item level information :
This consist of information at item level, like Item 1 has a material with a net price so and so, item 2 has another material with another net price and so and so.
Schedule line information :
This gives the information of the time a sales order has to be delivered to the customer, to view this select the item you want to view and to the menu under item >> Schedule line. This date is actually calculated from the delivery date in the Sales document.
Schedule line Agreement :
Use the T.code VA31 (and choose Scheduleline agreement) : This agreement lets you to predetermine scheduling of different materials with in a given period of time (This is same like the other contracts).
First enter the material with quantity say for example Material 1 Qty: 100, go to Edit from the menu >> Item >> Schedule line
There select within the time period defined two dates, say for example on 12: 01: 2005  40 quantity and on 13: 01: 2005 rest 60 (The qty has to be same as the one in the sales order) .
Once this is done you have created a schedule line agreement.
Call this agreement in your sales order (with reference) and use them.
Imp: You will be able to deliver only 40 qty on the 12th and 60 qty on the 13th, even though the sales order is for qty 100
Best Regards,
Amit.
Note: Schedule Line Category is also needed for Movement Type Determination and Availability Check.
SM30 - Table View - V_TVEPZ -> Assign schedule line categories
First check the Proposed schdule line category (SchLC)   - double click on the line item
VOV6 - Maintain the schedule line categories - double click on the line item
For example, you can control the default returns movement type.
651 - two steps - with a transfer posting using 453
653 - one steps - direct post to unrestricted used
Control the Transaction Flow (tick to activate the function)
transfer of requirement
for availability check for sales
production allocation active