[otrs] 2 customer auth backends, first one being HTTPBasicAuth

Hello, I have an otrs 3.0.5 setup, currently authenticated by apache (HTTPBasicAuth) I would like to add the local db auth system for the customer backend, and have followed the method telled by the FAQ http://faq.otrs.org/otrs/public.pl?Action=PublicFAQ&ItemID=219 However, that did not work. Apache's error log kept telling me "Message: Need User!" Can somebody tell me if its due to HTTPBasicAuth which cannot be used with another auth backend, or if my setup has to be corrected ? Regards, -- Mikael Kermorgant