I also used this xapi search from MapQuest to double check the raw data (the bounding box is Prague.) http://open.mapquestapi.com/xapi/api/0.6/node[amenity=parking][bbox=14.21767,49.98374,14.6408,50.20351]
I’m trying to help Dave here. We are both new to contributing with information to OSM so please excuse our ignorance.
We have moved the node a bit further away from the main road assuming the node was too close as you pointed out.
I have also added a new “parking_entrance” node (type amenity) on the highway itself just in front of the parking node, but I don’t know how to connect the relation if required?
It already shows up on page 3. To improve the routing to your underground parking add the highway=service ways leading to the parking entrance as explained in the amenity=parking wiki page.