diff --git a/datamodels/2.x/itop-portal-base/portal/web/css/portal.scss b/datamodels/2.x/itop-portal-base/portal/web/css/portal.scss
index d2e9d10dd..e8c2b2809 100644
--- a/datamodels/2.x/itop-portal-base/portal/web/css/portal.scss
+++ b/datamodels/2.x/itop-portal-base/portal/web/css/portal.scss
@@ -893,7 +893,7 @@ table .group-actions .item-action-wrapper .panel-body > p:last-child{
     border: 1px solid $gray-lighter;
 }
 .form_field.has-error div.cke{
-	border: 1px solid $state-danger-border;
+	border: 1px solid $state-danger-text;
 	border-radius: $border-radius-base;
 	box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
 }
diff --git a/js/form_field.js b/js/form_field.js
index 6f33ead5a..7d715e7b9 100644
--- a/js/form_field.js
+++ b/js/form_field.js
@@ -142,6 +142,11 @@ $(function()
 					oResult.is_valid = false;
 					oResult.error_messages.push(this.options.validators.mandatory.message);
 				}
+				// ... Field empty but not mandatory, no need to validate
+				else if( bEmpty && !bMandatory )
+				{
+					// It's okay, no need to validate
+				}
 				// ... Otherwise, we check every validators
 				else
 				{
diff --git a/sources/form/field/field.class.inc.php b/sources/form/field/field.class.inc.php
index 5c0ac1b6b..87672649f 100644
--- a/sources/form/field/field.class.inc.php
+++ b/sources/form/field/field.class.inc.php
@@ -393,12 +393,18 @@ abstract class Field
 	{
 		$this->SetValid(true);
 		$this->EmptyErrorMessages();
-		foreach ($this->GetValidators() as $oValidator)
+
+		$bEmpty = ( ($this->GetCurrentValue() === null) || ($this->GetCurrentValue() === '') );
+
+		if (!$bEmpty || $this->GetMandatory())
 		{
-			if (!preg_match($oValidator->GetRegExp(true), $this->GetCurrentValue()))
+			foreach ($this->GetValidators() as $oValidator)
 			{
-				$this->SetValid(false);
-				$this->AddErrorMessage($oValidator->GetErrorMessage());
+				if (!preg_match($oValidator->GetRegExp(true), $this->GetCurrentValue()))
+				{
+					$this->SetValid(false);
+					$this->AddErrorMessage($oValidator->GetErrorMessage());
+				}
 			}
 		}