diff --git a/datamodels/2.x/itop-portal-base/portal/src/forms/objectformmanager.class.inc.php b/datamodels/2.x/itop-portal-base/portal/src/forms/objectformmanager.class.inc.php
index 785958ef57..835c49d9fe 100644
--- a/datamodels/2.x/itop-portal-base/portal/src/forms/objectformmanager.class.inc.php
+++ b/datamodels/2.x/itop-portal-base/portal/src/forms/objectformmanager.class.inc.php
@@ -19,7 +19,6 @@
 
 namespace Combodo\iTop\Portal\Form;
 
-use Combodo\iTop\Form\Field\Field;
 use \Exception;
 use \Silex\Application;
 use \utils;
@@ -41,6 +40,7 @@ use \AttributeDateTime;
 use \AttachmentPlugIn;
 use \Combodo\iTop\Form\FormManager;
 use \Combodo\iTop\Form\Form;
+use \Combodo\iTop\Form\Field\Field;
 use \Combodo\iTop\Form\Field\FileUploadField;
 use \Combodo\iTop\Form\Field\LabelField;
 use \Combodo\iTop\Portal\Helper\ApplicationHelper;
@@ -715,20 +715,7 @@ class ObjectFormManager extends FormManager
                     {
                         // Note: We can't do this in AttributeExternalKey::MakeFormField() in the Field::SetOnFinalizeCallback() because at this point we have no information about the portal scope and ignore_silos flag, hence it always applies silos.
                         // As a workaround we have to manually check if the field's current value is among the scope
-
-                        if(!$oField->GetReadOnly())
-                        {
-                            /** @var DBObjectSearch $oValuesScope */
-                            $oValuesScope = $oField->GetSearch()->DeepClone();
-                            $oBinaryExp = new BinaryExpression(new FieldExpression('id', $oValuesScope->GetClassAlias()), '=', new ScalarExpression($oField->GetCurrentValue()));
-                            $oValuesScope->AddConditionExpression($oBinaryExp);
-                            $oValuesSet = new DBObjectSet($oValuesScope);
-
-                            if($oValuesSet->Count() === 0)
-                            {
-                                $oField->SetCurrentValue(null);
-                            }
-                        }
+						$oField->VerifyCurrentValue();
                     }
 					// - Field that require processing on their subfields
 					if (in_array(get_class($oField), array('Combodo\\iTop\\Form\\Field\\SubFormField')))
@@ -758,6 +745,11 @@ class ObjectFormManager extends FormManager
 											$oCustomField->SetSearchEndpoint($sSearchEndpoint);
 										}
 									}
+									// - Field that require to check if the current value is among allowed ones
+									if (in_array(get_class($oCustomField), array('Combodo\\iTop\\Form\\Field\\SelectObjectField')))
+									{
+										$oCustomField->VerifyCurrentValue();
+									}
 								}
 							}
 						}
@@ -1204,5 +1196,4 @@ class ObjectFormManager extends FormManager
 			$oAttachment->DBDelete();
 		}
 	}
-
 }
diff --git a/sources/form/field/selectobjectfield.class.inc.php b/sources/form/field/selectobjectfield.class.inc.php
index b74318aaa3..7a81a3d11e 100644
--- a/sources/form/field/selectobjectfield.class.inc.php
+++ b/sources/form/field/selectobjectfield.class.inc.php
@@ -19,8 +19,12 @@
 
 namespace Combodo\iTop\Form\Field;
 
-use \Closure;
-use \DBSearch;
+use Closure;
+use DBSearch;
+use DBObjectSet;
+use BinaryExpression;
+use FieldExpression;
+use ScalarExpression;
 use Combodo\iTop\Form\Validator\NotEmptyExtKeyValidator;
 
 /**
@@ -148,4 +152,26 @@ class SelectObjectField extends Field
 	{
 		return $this->sSearchEndpoint;
 	}
+
+	/**
+	 * Resets current value is not among allowed ones.
+	 * By default, reset is done ONLY when the field is not read-only.
+	 *
+	 * @param boolean $bAlways Set to true to verify even when the field is read-only.
+	 */
+	public function VerifyCurrentValue($bAlways = false)
+	{
+		if(!$this->GetReadOnly() || $bAlways)
+		{
+			$oValuesScope = $this->GetSearch()->DeepClone();
+			$oBinaryExp = new BinaryExpression(new FieldExpression('id', $oValuesScope->GetClassAlias()), '=', new ScalarExpression($this->currentValue));
+			$oValuesScope->AddConditionExpression($oBinaryExp);
+			$oValuesSet = new DBObjectSet($oValuesScope);
+
+			if($oValuesSet->Count() === 0)
+			{
+				$this->currentValue = null;
+			}
+		}
+	}
 }