MAGETWO-55395: Custom address attribute not appearing on Checkout summary

Author: RuslanKostiv1

app/code/Magento/Checkout/view/frontend/web/template/billing-address/details.html

@@ -13,7 +13,7 @@
     <!-- ko if: (currentBillingAddress().telephone) -->
     <a data-bind="text: currentBillingAddress().telephone, attr: {'href': 'tel:' + currentBillingAddress().telephone}"></a>
     <!-- /ko --><br/>
-    <!-- ko foreach: { data: address().customAttributes, as: 'element' } -->
+    <!-- ko foreach: { data: currentBillingAddress().customAttributes, as: 'element' } -->
         <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
             <!-- ko text: element[attribute].value --><!-- /ko -->
         <!-- /ko -->