Purpose of Calendar under Customer record

Work calendars are used by activity/time-card logic to choose a working date/start time and calculate overtime when an activity is tied to a project task or case for that customer location. 

In the shipments and sales orders, the calendar logic is not used.

hi ​@vshashkova , thanks for your response. So in that case if I’m looking where whenever the sales orders is created the Shipment should be generate for Monday. How can I set this up out of the box?

​@Harry there are no special settings to do it out of the box automatically but you can try to set up an import scenario to update it.