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Unfortunately it is not possbile to access the length parameter by relations.
Over a year ago, I created an idea for that at PTC Community (see http://communities.ptc.com/ideas/1050). You need to login with your PTC account, to see the idea. Don't hesitate to vote it up! 😉
Best regards, Domenic
In Reply to Janet Grove:
Is there a way to access this value in a note on a drawing?
Thanks!
Janet Grove