Sorry for the mailbox it was full of spam but now it's been cleared up.
I have printed your PDF file and concerning the 5 meters line it, it measures a little less than 10 centimeters (error is small) but concerning the 10 metres line, it measures 19.90 centimeters where it should measure 20 centimeters.
I think there is a problem in PM because I have posted the same message in an Archicad forum in France and at least two persons have made the following test: draw a 30 cm x 30 cm square in PM and then print, believe or not, those two persons have seen a difference between the dimension and the real size.....(both with Archicad 8.1 but one under XP, one under OSX and with two different printers)
It would be a very good thing if some of the readers here could give a shot at it.Draw a long line in PM, print and measure.....