Include select box for which recurring item a range refers to.

app/views/recurring_item_ranges/_form.rhtml

 <%= error_messages_for 'recurring_item_range' %>
 
 <!--[form:recurring_item_range]-->
+<p><label for="recurring_item_range_recurring_item_id">Item</label><br/>
+<%= select 'recurring_item_range', 'recurring_item_id', RecurringItem.find_all.collect { |i| [ i.description, i.id ] } %></p>
+
 <p><label for="recurring_item_range_amount">Amount</label><br/>
 <%= text_field 'recurring_item_range', 'amount'  %></p>
 
@@ -8,6 +11,7 @@
 <%= date_select 'recurring_item_range', 'startdate'  %></p>
 
 <p><label for="recurring_item_range_enddate">Enddate</label><br/>
-<%= date_select 'recurring_item_range', 'enddate'  %></p>
+<%= date_select 'recurring_item_range', 'enddate', :include_blank => true %></p>
+
 <!--[eoform:recurring_item_range]-->