issue with WSDL import which has basic authentication

Hi, Smartbear team:

I have one WSDL which is protected by basic user authentication. however I got so many times of login prompt. after inspecting the wsdl, I noticed I have schema import in it.
and for each import, soapui prompt login. however it is not the case for browser.

I'm using latest version soapui 5.0.0. is it bug or feature enhancement?

Thanks,
Griffin