Custom Configuration Section Inheritance

I have a web.config custom configuration section using asp.net 2.0
configuration APIs. My custom configuration section inherits from
System.Configuration.ConfigurationSection.

I have a IIS root level web.config and an application level web.config, with
the application web.config inheriting from the root level web.config.

I am receiving the following message when compiling the web application...

"....Section or group name 'httpCompressionAgent' is already defined.
Updates to this may only occur at the configuration level where it is
defined....."


From the above error message it would appear that inheritance of this
particular web.config custom configuration section is being resisted.

Help !!! I can not figure this one out.

I have other custom configuration sections which are using inheritance just
fine.

--
Philip