¿Por qué Apache mod_rewrite reescribe dos veces mi URL?

Necesito reescribir/admin/page/create URL a/backend/www/index.php/page/create, así que uso la siguiente regla y condiciones de reescritura de Apache:

RewriteCond %{REQUEST_URI} !-f
RewriteCond %{REQUEST_URI} !-d
RewriteCond %{REQUEST_URI} !backend\/www

RewriteRule admin\/(.*)$ backend/www/index.php/$1 [NS,L]

Sin embargo, al examinar el registro de reescritura, veo que Apache reescribe correctamente la URL, pero al final realiza una reescritura adicional considerando/page/create URL, que no coincide con ninguna condición, por lo que falla y recibo el"Fichero de entrada no especificado." error.

¿Cómo puedo evitar que Apache realice esa reescritura adicional? solíaNS bandera yRewriteCond %{IS_SUBREQ} f Condición y también realiza la subrequest.

¡Gracias!

80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (2) init rewrite engine with requested uri /admin/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (1) pass through /admin/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] add path info postfix: /home/daniloaz/dev.daniloaz.com/httpdocs/admin -> /home/daniloaz/dev.daniloaz.com/httpdocs/admin/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] strip per-dir prefix: /home/daniloaz/dev.daniloaz.com/httpdocs/admin/page/create -> admin/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] applying pattern 'admin\/(.*) to uri 'admin/page/create'
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (4) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] RewriteCond: input='/admin/page/create' pattern='!-f' => matched
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (4) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] RewriteCond: input='/admin/page/create' pattern='!-d' => matched
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (4) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] RewriteCond: input='/admin/page/create' pattern='!backend\/www' => matched
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (4) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] RewriteCond: input='/admin/page/create' pattern='((admin\/(.*)$)|(admin$))' => matched
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (4) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] RewriteCond: input='false' pattern='f' => matched
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (2) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] rewrite 'admin/page/create' -> 'backend/www/index.php/page/create'
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] add per-dir prefix: backend/www/index.php/page/create -> /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (2) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] strip document_root prefix: /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php/page/create -> /backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a35d60/initial] (1) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] internal redirect with /backend/www/index.php/page/create [INTERNAL REDIRECT]
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (2) init rewrite engine with requested uri /backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (1) pass through /backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] add path info postfix: /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php -> /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] strip per-dir prefix: /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php/page/create -> backend/www/index.php/page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (3) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] applying pattern 'admin\/(.*) to uri 'backend/www/index.php/page/create'
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a472f0/initial/redir#1] (1) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] pass through /home/daniloaz/dev.daniloaz.com/httpdocs/backend/www/index.php
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a4ce60/subreq] (2) init rewrite engine with requested uri /page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a4ce60/subreq] (1) pass through /page/create
80.29.4.44 - - [13/Jun/2013:21:40:54 +0200] [dev.daniloaz.com/sid#7f65e59b6a78][rid#7f65e5a4ce60/subreq] (1) [perdir /home/daniloaz/dev.daniloaz.com/httpdocs/] pass through /home/daniloaz/dev.daniloaz.com/httpdocs/page

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