found it. looks like the jquery autocomplete currently is only used on 
the product properties section

On 26-06-2013 06:09, Ryan Bigg wrote:
>
> In backend/app/assets/javascripts/admin/spree_backend.js:
>
> > @@ -1,5 +1,7 @@
> >  //= require jquery-migrate-1.0.0
> > -//= require jquery-ui
> > +//= require jquery.ui.datepicker
> > +//= require jquery.ui.sortable
> > +//= require jquery.ui.autocomplete
>
> What are we using jquery.ui.autocomplete for?
>
> —
> Reply to this email directly or view it on GitHub 
> <https://github.com/spree/spree/pull/3217/files#r4886934>.
>

-- 
Washington L Braga Jr
Developer
Spree Commerce, Inc.