MAGETWO-95739: Zip code is not validated during checkout when "My billing and shipping address are the same" is unchecked

Author: wert2all

app/code/Magento/Checkout/view/frontend/web/js/view/billing-address.js

@@ -73,9 +73,7 @@ function (
             quote.paymentMethod.subscribe(function () {
                 checkoutDataResolver.resolveBillingAddress();
             }, this);
-            shippingRatesValidator.initFields(
-                'checkout.steps.billing-step.payment.payments-list.checkmo-form.form-fields'
-            );
+            shippingRatesValidator.initFields(this.get('name') + '.form-fields');
         },
 
         /**