When I was told "that kind of seat can only go FF" I just said, "My understanding is that it's my choice which way to install it. I'm willing to comply with your directions, but may I please see where it says that in the manual?" I made eye contact and was polite in tone and smiled my nicest smile. That was all it took. They checked the manual and informed me I was right. Just don't be confrontational so you don't get kicked off.