Hello Karan,
Perhaps, you would already be knowing that there is something called Checking Horizon and system starts looking for the available receipts and stock elements starting today. Let us take an example here.
Today's date :- 16.01.2014.
Stock on Hand - 200 Pcs - 16.01.2014
Reciept 1 - 15 Pcs - 16.01.2014
Reciept 2 - 80 Pcs - 17.01.2014
Reciept 3 - 150 Pcs - 20.01.2014
All the above stock/reciept elements are in Plant 1.
Now, Plant2 has a stock of 500 PCs on today's day 16.01.2014
Now, imagine there is a sales document that is being introduced with an ordered quantity of 2000 PCs. Now, the key to look for the rule or scope of check it depends on two things.
1) Checking Horizon
2) Delay Parameter that you might have defined in the Calculation Profile.
( FYI..Delay overrules CH )
So..Considering the above example, suppose if your CH is 8 days, system will confirm the sales doc from Plant 1 with 200+15+80+150 = 445PCs and then it switches to Plant 2 because of the rule that you had setup. However, while checking how long in the future you need to look for stock / receiept elements in both the locations calculation profile plays a major role. If you CH > Delay in CP, Delay always takes the priority.
To answer your question in a crisp way, system never follows sequence of scope of check elements. It identifies whether it is a reciept or demand. All the receiepts will be cumulated together and starts allocating the stock to the incoming demand. The cumulation again depends on the dates.If two receiept elemens are falling on the same day, I suppose any demand that is falling on or later that day would be able to use this receiept element.
Hope this helps.
Babu Kilari