Be careful
It will really be every 3 days.
Tomorrow it will create a new pur req for the next 3 days of demand.
as TLB probably create the STO for the 3 days worth of demand yesterday, the new pur req will be for one day's worth of demand. So now you will have a pur req for every day as every day the next 3 days of demand is not totally met.
Ken