.htaccess rewrite rule - What have I done wrong?

I want to access:
http://www.site.com/archive/category/page/4/?tag=computers
via the url:
http://www.site.com/archive/category/topic/computers/page/4/

I have the following:

RewriteRule ^archive/category/topic/(.*)/page/(.*)/$ /archive/category/page/$2/?tag=$1 [L]

Code (markup):

However it does not go to the right page, however when I put [R=301,L] it redirects to the correct page.

 

Hope you're trying to add another rule in your WP Site right??
It need some modifying in WP hatccess
Contact me if you cant do that

 

I have added in another rule in htaccess.

But I get a 404 page.

Here is the details of .htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wp/

RewriteRule ^archive/category/topic/(.*)/page/(.*)/$ /archive/category/page/$2/?tag=$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wp/index.php [L]
</IfModule>

Code (markup):