IIS and Entity Framework connectionstring seem duplicated but cannot see where

Question

When I run my asp.net mvc2 web application using IIS7.5 and connecting up to SQL2008 I get the following messge:

"The entry 'XXXEntities' has already been added.\Projects\ProjectName\web.config line 32"

Now I think from what I previously read that IIS is reading it twice but can only find this string in the root web.config.

Can anyone give me an idea what I can do to get over this?

thanks