Apache + modSSL + errorDoc

Hello,

I've got a little problem with my errors docs with SSL. I explain.

Here is the structure of my test website :

www
\--docs
\--errors

I set up a SSL with auto-signed certs. It works ok. Now, I want to
authenticate users with certs.

It also works :) When the user cert is not the one I expect, It says 403
:)

When I want to customize my 403.txt message, I use

ErrorDocument 403 /errors/403.txt

but, it doesn't work and answer the an error occured when processing the
Errordocument directive. in the logs " failed, reason: SSL requirement
expression not fulfilled (see SSL logfile for more details)"

If you ask for, here is my config :

<VirtualHost *:443>
ServerAdmin xxxx@xxxxx
DocumentRoot /www
ServerName doff.servebeer.com
ErrorLog logs/www-log
LogFormat "%a %h %t %u \"%r\" %>s %b %X %{SSL_PROTOCOL}x %
{SSL_CIPHER}x %{SSL_CLIENT_S_DN}x" custom
CustomLog logs/doff.servebeer.com-log custom

# SSL mode
SSLEngine on
SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSL v2:
+EXP:+eNULL
SSLCertificateFile /disk/sites/CERTS/www.crt
SSLCertificateKeyFile /disk/sites/CERTS/www.key
SSLCACertificateFile /disk/sites/CERTS/ca.crt
SSLVerifyClient optional
SSLOptions StdEnvVars OptRenegotiate
SSLCACertificatePath /disk/sites/CERTS/valid/
SSLCARevocationPath /disk/sites/CERTS/revoqued/
SSLVerifyDepth 1

ErrorDocument 403 /errors/403.txt

<Directory /www>
SSLRequire %{SSL_CLIENT_I_DN} =~ m/CN=MY_CN/
Options Indexes
</Directory>

# Error pages
<Directory /www/errors>
SSLOptions +FakeBasicAuth
SSLVerifyClient none
Options Indexes
AllowOverride all
Order Allow,Deny
Allow from all
Satisfy any
</Directory>
</VirtualHost>


So, my question is : is it possible to have a complete site access with
users certs, EXCEPT one subdirectory, that shows errors in case you dont
have user cert ?

Thanks in advance.