Apache Object not found/File does not exist Error

In my apache I have the lines below in the Server Config section. I know they are getting read because I put a LogFormat just above them and was able to change my log format by doing so.

I am passing a URL like: http://www.wrongurl.com/dev.myurl.com

I'm allowing http://www.wrongurl.com/ to get to my apache server by have my DNS setup to point to the server for wrongurl.com.

My understanding of rewrite is that I could rewrite the URL to a URL that the server was setup for, in this case, http://dev.myurl.com and all would be fine. However, I cannot get the URL to be rewritten. Even when I put the code below to be the very first lines in the httpd.conf file which the first/main conf file to be read.

Instead I get an error in the log like this: [error] [client 192.168.17.1] File does not exist:
and a 404 error in the browser that says: Object not found!

I have apache setup for virtual hosting and have about 6 domains on it that I use locally as I am a web developer. I'm guessing there is some apache setting that I need to loosen up a bit to allow it to process wrongurl.com at all, but that's just a wild guess.

Obviously I should not be sending apache the wrong domain in the first place but this small amount of code (the 3 lines) is just a test that I would like to make work for something more involved.

Is there an apache expert out there that could shed some light on this?

Thanks!
Reg

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Lines in server config:
 
RewriteEngine on
RewriteCond %{HTTP_HOST} !^dev\.myurl\.com$ [NC]
RewriteRule .* http://dev.myurl.com/