Why does turbo tax creates a second k-1 when importing current year data into existing k-1

When I import .txf files from tax package support website TT creates a new entry rather than updating info from previous year's entry which was imported into the 2016 version of my return. Why isn't the current information imported into the existing entry and updated for current year? Is there a method to import or must I manually input year 2016 info?