each position has a duration. suppose there a position 'Human Resource Manager' This position may have a duration from JAN-1-2010 to DEC-31-2013. now if you try to add a new position within same positionId, it must not overlap exiting duration. By overlapping it can be as under for example if I selected same postionId and duration as May-1-2010 to FEB-18-2013 its is overlapping as JAN-1-2010 comes within range.
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