From d1a504a825feea33c6f79b63c394588819135710 Mon Sep 17 00:00:00 2001
From: Kristjan Heinaste <kristjan@ontapgroup.com>
Date: Tue, 30 Aug 2016 14:20:16 +0300
Subject: [PATCH] Fixed a bug where multiline control did not apply appropriate
 css classes when validation failed.

---
 .../Magento/Checkout/Block/Checkout/AttributeMerger.php    | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app/code/Magento/Checkout/Block/Checkout/AttributeMerger.php b/app/code/Magento/Checkout/Block/Checkout/AttributeMerger.php
index 1882d88e04a8b..0d7754244220a 100644
--- a/app/code/Magento/Checkout/Block/Checkout/AttributeMerger.php
+++ b/app/code/Magento/Checkout/Block/Checkout/AttributeMerger.php
@@ -272,10 +272,11 @@ protected function getMultilineFieldConfig($attributeCode, array $attributeConfi
                         ['required-entry' => (bool)$attributeConfig['required']],
                         $attributeConfig['validation']
                     )
-                    : $attributeConfig['validation'],
-                'additionalClasses' => $isFirstLine ? 'field' : 'additional'
-
+                    : $attributeConfig['validation']
             ];
+            if (!$isFirstLine) {
+                $line['additionalClasses'] = 'additional';
+            }
             if ($isFirstLine && isset($attributeConfig['default']) && $attributeConfig['default'] != null) {
                 $line['value'] = $attributeConfig['default'];
             }