[OSM-newbies] finding nodenumbers in josm

[Rik]

Hi,

I did some hiking path tagging the last few days. Because I didn't come
along a wifi-point I couldn't upload small parts of the route and had to
store my work locally. I stored them using JOSM. Now that I am ready I
want to upload them to the OSM-server, but I get an error:
<start error>
Uploading to the server failed because your current dataset violates a
precondition. The error message is: Response code=412, Error
Header=<Precondition failed: Way requires the nodes with id in
(48462867), which eather do not exist, or are not visible.>
<end error>

I am trying to find out where I can find node 48462867 in JOSM, but I
don't manage. Can anyone tell me how I can find specific nodenumbers in
JOSM or in any other OSM-tool ?

Thanks, Rik