Hi Erik,
Thanks.
Warnings are usually a nice feature but can only serve as a hint to check something. I'm no friend of simply running around "fixing" stuff just because Osmose or JOSM don't like the way something looks.

In this case I believe it's better information to see which sides of the road have a "bicycle lane" (wouldn't really call it that, but Germany has still a long way to go). Just stating that there is a lane is less precise while there is established tagging for better information.

Cheers
Silversurfer83 