Duplicate meta data for 301 redirected items

[Madlena]

Google webmaster tools tells me that I have duplicate title tags for two items. They have the same product ID. When there is a change in SEO URL, the system does an automatic 301 redirect of  the first item towards the second item, like in the example below:
22"x28" White Foam Board School Project Kit|Geographics.com
/p48998/foam-board-school-project-kit-22-x-28/product_info.html /p48998/white-foam-board-school-project-kit/product_info.html

What are we doing wrong that Google asks for different meta data for a 301 redirect?

Thanks!

[MichaelC-15022]

What you're doing looks fine to me.  The old URL should drop out of Webmaster Tools after a while.  How long has it been since GWT reported this?

[customerparadigm.com]

Madlena-

One thing you could do to avoid the duplicate content penalty is to change the rel canonical tag on the first item to point to the second one.

For example,
change the rel canonical tag on this page (if it still exists): http://www.geographics.com/p48998/foam-board-school-project-kit-22-x-28/product_info.html

to this:

... then Google won't consider this a duplicate page.

Hope this helps?
-- Jeff

[webmethod]

I get exactly the same reports from Webmaster tools when I rename products on my website. The crawler just needs to catch up and so long as your redirect is set up properly (it also looks fine to me) then this will drop out in time as Michael says.

George