HT4061 itunes want sync a flim which i have rented to my ipad

i get a message which says that it is already synced with another device?
but its only just downloaded to my computer

You have to "move" the film to the iPad from iTunes. This is copied from here.
http://support.apple.com/kb/HT1390
Once the rental is downloaded, you can watch it on your computer or transfer the rental to a supported iPod, iPhone, iPad, or Apple TV (1st generation):
Connect the device and select it in iTunes.
Click the Movies button.
Select the movie, and then click Move.
After all movies have been moved, click Apply in the lower-right corner of iTunes.
You must be connected to the Internet to transfer a rented movie.

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