Displaying overdue PO's

Why would you want to make non-sargable WHERE condition? 

Why not

DueDate < dateadd(day, -3, CURRENT_TIMESTAMP)

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Good point, thanks for the correction. A sargable query would be better. 

Note, however, that depending on what the OP means by "past that date over 3 days" the CURRENT_TIMESTAME needs to be cast as a date.  If the duedate column contains 2015-04-24 00:00:00.000 and the OP only wants that row to be returned if the current date is 2015-04-28 or later, then the above where condition needs to be

DueDate < dateadd(day, -3, CAST(CURRENT_TIMESTAMP as date))

Tom