During ATP check the backward scheduling is not confirming the sales order on requested delivery date.
There is enough inventory at location to cover the requirement.
Lets assume current date when order is being created as 9/11
If order is created with requested delivery date as 9/11 i.e. current date, system proposes confirmed delivery date 9/15 as below.
MAD = 9/11
PICK/PACK = 1 day = 9/12
LOAD = 1 day = 9/13
TRAN = 2 day = 9/15
So, the latest the order can be confirmed is by 9/15, So if I ask requested delivery date as 9/15 then it should be confirmed on that date. But the system is considering the MAD as 9/15 during backward scheduling and then adding lead time of 4 days in forward scheduling to confirm the order for 9/19.
If requested delivery date is changed to 9/14, then MAD is considered as 9/14 during backward scheduling and then add 4 days lead time in forward scheduling to proposed 9/18 as confirmed delivery date.
goods receiving hours at ship to location are 24/7 so no impact due to it.
We using GATP for transportation and shipment scheduling for sales order.