duplicate title tags and descriptions in webmaster tools

Still a bit new at this so please go easy on me and I have tried searching for an answer but have been unable to find one that specifically helps me. I have a wordpress site that I have built a custom php page to deliver results from a database to display information and have manually inserted code to display the header and footer of my wordpress theme.

Also, in my .htaccess I have used the

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rewriterule ^used-boats-for-sale/(.*)/(.*)/(.*)/(.*)/(.*)/$ /boatdetails.php?recordnumber=$5 [L]

to forward the friendly url so the php page can process the correct record number to process and display the results. This was the only way I could figure out how to do this in wordpress and bypass wordpress’s subfolder killer.

My issue arises as google webmaster tools is telling me I have duplicate title tags and descriptions, even though I have added a canonical reference to the friendly url.

Examples of both can be seen here:

http://www.unitedyacht.com/used-boats-for-sale/hinckley/downeast/cruiser/2000/1807/

and

http://www.unitedyacht.com/boatdetails.php?recordnumber=1807

So with the canonical, why is google still showing it as a dupe and what can I do to correct it? If I put a r=301 in, it redirects the url completely and removes the friendly url from the browser.

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