Well, what I know about test kits and water tests can be found at:
http://home.comcast.net/~tomstank/tomstank_files/page0018.htm
Basically, chloramine (or monochloramine, to be more exact) is a chlorine molecule bound to an ammonia molecule. This has bacteriocidal properties and is more stable, longer lasting, and more effective than chlorine in the water. It is approved for use up to about 3 ppm, I think, but most aquarists find it at 0.25 to 1 ppm, sometimes a little higher.
The ammonia test in the AP kit is a two bottle salicylate test. The first bottle adds chlorine and pH adjusters, so that if there is ammonia in the sample it will be converted to chloramine. Then an indicator is added with the second bottle, and the ammonia amount is measured by the amount of chloramine it was converted into. Thus, it stands to reason that if you have chloramine in the water, it too will turn the test color. This has been verified by several different AA posters who have chloramines in thier tap water.
Now, what to do about the chloramine for a water change? Aeration will not remove chloramine, like it would chlorine. Thus, as a minimum, a dechlorinator must be used. All dechlorinators will break the chlorine - ammonia bond, leaving ammonia behind and letting chlorine diffuse out of the tank. Examples of a simple dechlorinator is Thiosulfate.
The other water treatments contain slightly more complicated molecules that can also "bind" the ammonia that is left behind. Using such conditioners, the ammonia left behind may or may not show up on a salicylate ammonia test. If the conditioner still lets the ammonia be detected, that does not mean it didn't work. If the conditioner caused the ammonia to not be detected, that doesn't mean the ammonia was "removed" from your tank (your test just doesn't turn color anymore with the conditioner interfering with it). All ammonia binder treatments cause a false high ammonia test with the one step Nessler based reagents.
So, what should you do for a water change? Use a dechlor at minimum, a dechlor with ammonia binder if you want. The chlorine diffuses out, the ammonia left behind is dispatched by your biologic filter rather rapidly (once the biofilter is mature) wether you "bound" it or not.