Availability check in Sales Order

Hi,

In sales order availability check system check available quantity and if it is not there it propose next delivery date based on in house production time in Material Master.Now I maintain lot size dependent setup time and processing time instead of In-House prodution time.e.p.

Material A has 0 stock

Set up time 5 days

Processing time 1 days for 10 basse quantity.

Now if I book order for say 100

system should give me delivery proposal as bellow

5+100/10=15 days as In-house production time and give delivery date accordingly

i.e say if order is created on 01.01.08 then propose delivery on 15.01.08

But system on considering 5+1=6 days for any order quantity i.e. wheather it is 100 or 1000 system giving delivery date after 6 days from order creation date.

So what configuration I have to done if I want system to check lot size dependent delivery date in sale order availability check?