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Are you allowed to shoot at a target that you can't hurt just to that you are able to declare a charge against it? This is in particular reference to Imperial Knights shooting their secondary weapons at a tank that they want to assault while using their main battle cannon to blast infantry.

Rules questions go in the You Make Da Call sub-forum (http://www.dakkadakka.com/dakkaforum/forums/show/15.page).

And yes, you can shoot at a target you cannot hurt provided you have range and Line of Sight to the unit, and it is not Locked in combat. Likewise you can charge a unit you cannot hurt.

I thought there was an exception for vehicles you couldn't hurt?

That was a change from 6th to 7th. Now you can charge a unit you can't hurt. See page 45 under Declaring a Charge.