>>Your first ui-view is not named.....
>
>I know it's not named. This is to allow a loop like this:
>
>

><tabset vertical="true" type="pills">
>                                    <tab ng-repeat="tab in tabsViews" select="selectView(tab.index)" ng-show="tab.isVisible"
>                                         class=" {{tabsViews[tab.index-1]['invalid'] ? 'invalid-tab': 'valid-tab' }}">
>                                        <tab-heading>{{tab.title}}</tab-heading>
>                                    </tab>
>                                </tabset>

I don't understand what the tabset has to do with it. Your 'edit.invoices' state defines two views but your markup only has a placeholder for one....