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 379da9cde9..785958ef57 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
@@ -1,6 +1,6 @@
 <?php
 
-// Copyright (C) 2010-2017 Combodo SARL
+// Copyright (C) 2010-2018Combodo SARL
 //
 //   This file is part of iTop.
 //
@@ -49,6 +49,7 @@ use \Combodo\iTop\Portal\Helper\ApplicationHelper;
  * Description of objectformmanager
  *
  * @author Guillaume Lajarige <guillaume.lajarige@combodo.com>
+ * @since iTop 2.3.0
  */
 class ObjectFormManager extends FormManager
 {
@@ -611,13 +612,14 @@ class ObjectFormManager extends FormManager
                     // - Else if it's must change (transition), we force it as not readonly and not hidden
                     elseif (($iFieldFlags & OPT_ATT_MUSTCHANGE) === OPT_ATT_MUSTCHANGE && $this->IsTransitionForm())
                     {
-                        $oField->SetReadOnly(false);
+	                    $oField->SetMustChange(true);
+	                    $oField->SetReadOnly(false);
                         $oField->SetHidden(false);
                     }
-                    // - Else if it's must prompt (transition), we force it as not readonly and not hidden
+                    // - Else if it's must prompt (transition), we force it as mustchange, not readonly and not hidden
                     elseif (($iFieldFlags & OPT_ATT_MUSTPROMPT) === OPT_ATT_MUSTPROMPT && $this->IsTransitionForm())
                     {
-                        $oField->SetReadOnly(false);
+                    	$oField->SetReadOnly(false);
                         $oField->SetHidden(false);
                     }
                     // - Else if it wasn't mandatory or already had a value, and it's hidden, we force it as hidden
diff --git a/sources/form/field/caselogfield.class.inc.php b/sources/form/field/caselogfield.class.inc.php
index c14545d96a..fc0cae63e4 100644
--- a/sources/form/field/caselogfield.class.inc.php
+++ b/sources/form/field/caselogfield.class.inc.php
@@ -1,6 +1,6 @@
 <?php
 
-// Copyright (C) 2010-2016 Combodo SARL
+// Copyright (C) 2010-2018 Combodo SARL
 //
 //   This file is part of iTop.
 //
@@ -19,19 +19,26 @@
 
 namespace Combodo\iTop\Form\Field;
 
-use \Closure;
-use \DBObject;
-use \Combodo\iTop\Form\Field\TextAreaField;
-
 /**
  * Description of CaseLogField
  *
  * @author Guillaume Lajarige <guillaume.lajarige@combodo.com>
+ * @since iTop 2.3.0
  */
 class CaseLogField extends TextAreaField
 {
 	protected $aEntries;
 
+	/**
+	 * @param bool $bMustChange
+	 * @return $this
+	 */
+	public function SetMustChange($bMustChange)
+	{
+		$this->SetMandatory($bMustChange);
+		return $this;
+	}
+
 	/**
 	 *
 	 * @return array
diff --git a/sources/form/field/field.class.inc.php b/sources/form/field/field.class.inc.php
index 417175e595..58f61044a9 100644
--- a/sources/form/field/field.class.inc.php
+++ b/sources/form/field/field.class.inc.php
@@ -1,6 +1,6 @@
 <?php
 
-// Copyright (C) 2010-2017 Combodo SARL
+// Copyright (C) 2010-2018 Combodo SARL
 //
 //   This file is part of iTop.
 //
@@ -27,6 +27,7 @@ use \Combodo\iTop\Form\Validator\MandatoryValidator;
  * Description of Field
  *
  * @author Guillaume Lajarige <guillaume.lajarige@combodo.com>
+ * @since iTop 2.3.0
  */
 abstract class Field
 {
@@ -134,6 +135,18 @@ abstract class Field
 		return $this->bReadOnly;
 	}
 
+	/**
+	 * Note: This not implemented yet! Just a pre-conception for CaseLogField
+	 *
+	 * @todo Implement
+	 * @return boolean
+	 */
+	public function GetMustChange()
+	{
+		// TODO
+		return false;
+	}
+
 	/**
 	 *
 	 * @return boolean
@@ -272,6 +285,20 @@ abstract class Field
 		return $this;
 	}
 
+	/**
+	 * Sets if the field is must change or not.
+	 * Note: This not implemented yet! Just a pre-conception for CaseLogField
+	 *
+	 * @todo Implement
+	 * @param boolean $bMustChange
+	 * @return \Combodo\iTop\Form\Field\Field
+	 */
+	public function SetMustChange($bMustChange)
+	{
+		// TODO.
+		return $this;
+	}
+
     /**
      *
      * @param $sDisplayMode