Hi Ashish,
Residence time : In a border way, its about defining a criteria for archiving of your orders by setting deletion flag & deletion indicator.
Residence time 1 ( In calendar months) = Time of Setting deletion indicator - Time of Setting deletion flag.
Residence time 2 ( In calendar months) = Time of Archiving your order- Time of Setting deletion indicator.
In your requirement, if you don't wan to delete orders at all, then keep residence time 1& 2 as blank.
Regards,
Amol
