Business Portal error on new Requisition request (HTTP 404 page cannot found)

I installed BP 5.1 for GP2010, all works great excep for the "New Requisition" link, for some reason it redirect me to another route.

I installed BP in this site:

http://myserver/Greatplains/BP/

but when clicking "New Requisition" I got redirected to:

http://myserver/BusinessPortal/

checking IIS I found a site named BusinessPortal and Im assuming BP creates it on install. So the question is, why Im getting a 404 page not found error, if the page really exists?