Can a BN commander tell you not to drive your POV and you have to follow that order?

I had a motorcycle, Our Post Policy says we can drive them all year round as long as the roads are green. Our BDE Command has said no driving after 1 NOV or first snowfall. It have never been written into a Policy memo at all, Just word of mouth. I was the BN Command Group Driver for out BN. I drove my bike to work one day and told me that i wasn't supposed to be riding that. The BDE Commander put out after 1 NOV no body rides, and i don't want you to get caught be someone higher up and have them yell at you and me. I was like HOOAH RGR. I figured this was only on post. Thats how i perceived it. I get into a wreck a few weeks later. Luckily no really serious injury. Bad bruises. No the BN CMD is saying i disobeyed a direct order and operated in the grey lines. I've done my research there is nothing they can do to get me in trouble. But they relocated me out of my position as the driver. They say they are not pursing UCMJ but i feel that im walking on thin ice now. That if i do something slightly wrong or mess up. they will drop the hammer. Can anyone give further guidance on this kind of situation.