If you want a calculated column, here is an example. See Counting working days in DAX - SQLBI
COUNTROWS ( 'Date'),
DATESBETWEEN ( 'Date'[Date], Sales[Order Date], Sales[Delivery Date] – 1 ),
'Date'[IsWorkingDay] = TRUE,
ALL ( Sales )
Take notice that when using DATESBETWEEN(<Dates>, <StartDate>, <EndDate>), if StartDate is larger than EndDate, the result is an empty table. So you may need to add an IF condition to decide which date ('ScheduledDate' and 'CompletedDate') is larger before calculating net working days.
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