can't target /summon-ed arrows

you can't target any /summon-ed arrows, it'll give the error message

An unknown error occured while attempting to preform this command

and the server log will say

[xx:xx:xx] [Server thread/WARN]: Couldn't process command: 'YOUR COMMAND HERE'

steps to reproduce:

/summon Arrow

/entitydata @e[type=Arrow] {}

stangely, though,

/kill @e[type=Arrow]

works fine