Error message displays backend server name : Reverse Proxy

Hi Experts,
We are using Apache 2.2.16 for reverse proxy.Below is the scenario.
browser -
>Apache server -
>SAP Web Dispatcher -
>SAP SRM Portal---->SAP SRM ( backend )
Now https://apache_server_host:443/irj works fine. but whenever we select one iview , there is dump in backend system & error message at portal displays backend server.
e.g
Error application is coming up.
20101012
BASIS
074335
srmhost
http://srmhost.xyz.com8000/sap/bc/webdynpro/sapsrm/wda_l_fpm_oif/
RAISE_EXCEPTION
Exception condition "PURCHORG_NOT_FOUND" raised.
Now can we hide , srmhost ( backend ) or can we replace srmhost with Apache host name.
I am trying mod_substitute but it is not doing anything .
Best Regards,
Tushar.

Solved by
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|http://srmhost:8000|https://apache_host|ni"

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