diff --git a/htdocs/fichinter/card.php b/htdocs/fichinter/card.php
index 953b48a8adf..8035c2a2e98 100644
--- a/htdocs/fichinter/card.php
+++ b/htdocs/fichinter/card.php
@@ -1577,7 +1577,7 @@ else if ($id > 0 || ! empty($ref))
 		{
             if ($action != 'editdescription' && ($action != 'presend')) {
                 // Validate
-                if ($object->statut == 0 && (count($object->lines) > 0 || !empty($conf->global->FICHINTER_DISABLE_DETAILS))) {
+                if ($object->statut == Fichinter::STATUS_DRAFT && (count($object->lines) > 0 || !empty($conf->global->FICHINTER_DISABLE_DETAILS))) {
                     if ((empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->creer) || (!empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->ficheinter_advance->validate)) {
                         print '<div class="inline-block divButAction"><a class="butAction" href="card.php?id=' . $object->id . '&action=validate"';
                         print '>' . $langs->trans("Validate") . '</a></div>';
@@ -1585,7 +1585,7 @@ else if ($id > 0 || ! empty($ref))
                 }
 
                 // Modify
-                if ($object->statut == 1 && ((empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->creer) || (!empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->ficheinter_advance->unvalidate)))
+                if ($object->statut == Fichinter::STATUS_VALIDATED && ((empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->creer) || (!empty($conf->global->MAIN_USE_ADVANCED_PERMS) && $user->rights->ficheinter->ficheinter_advance->unvalidate)))
 				{
 					print '<div class="inline-block divButAction"><a class="butAction" href="card.php?id='.$object->id.'&action=modify">';
 					if (empty($conf->global->FICHINTER_DISABLE_DETAILS)) print $langs->trans("Modify");
@@ -1594,7 +1594,7 @@ else if ($id > 0 || ! empty($ref))
 				}
 
 				// Send
-				if ($object->statut > 0)
+				if ($object->statut > Fichinter::STATUS_DRAFT)
 				{
 					if (empty($conf->global->MAIN_USE_ADVANCED_PERMS) || $user->rights->ficheinter->ficheinter_advance->send)
 					{
@@ -1606,10 +1606,10 @@ else if ($id > 0 || ! empty($ref))
 				// Event agenda
 				if (! empty($conf->global->FICHINTER_ADDLINK_TO_EVENT))
 				{
-					if (! empty($conf->agenda->enabled) && $object->statut > 0)
+					if (! empty($conf->agenda->enabled) && $object->statut > Fichinter::STATUS_DRAFT)
 					{
 						$langs->load("agenda");
-						if ($object->statut < 2)
+						if ($object->statut < Fichinter::STATUS_BILLED)
 						{
 							if ($user->rights->agenda->myactions->create) print '<div class="inline-block divButAction"><a class="butAction" href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create&amp;origin='.$object->element.'&amp;originid='.$object->id.'&amp;socid='.$object->socid.'&amp;backtopage='.urlencode($_SERVER["PHP_SELF"].'?id='.$object->id).'">'.$langs->trans("AddEvent").'</a></div>';
 							else print '<div class="inline-block divButAction"><a class="butActionRefused" href="#" title="'.$langs->trans("NotEnoughPermissions").'">'.$langs->trans("AddEvent").'</a></div>';
@@ -1618,10 +1618,10 @@ else if ($id > 0 || ! empty($ref))
 				}
 
 				// Proposal
-				if (! empty($conf->propal->enabled) && $object->statut > 0)
+				if (! empty($conf->propal->enabled) && $object->statut > Fichinter::STATUS_DRAFT)
 				{
 					$langs->load("propal");
-					if ($object->statut < 2)
+					if ($object->statut < Fichinter::STATUS_BILLED)
 					{
 						if ($user->rights->propal->creer) print '<div class="inline-block divButAction"><a class="butAction" href="'.DOL_URL_ROOT.'/comm/propal/card.php?action=create&amp;origin='.$object->element.'&amp;originid='.$object->id.'&amp;socid='.$object->socid.'">'.$langs->trans("AddProp").'</a></div>';
 						else print '<div class="inline-block divButAction"><a class="butActionRefused" href="#" title="'.$langs->trans("NotEnoughPermissions").'">'.$langs->trans("AddProp").'</a></div>';
@@ -1629,10 +1629,10 @@ else if ($id > 0 || ! empty($ref))
 				}
 
 				// Invoicing
-				if (! empty($conf->facture->enabled) && $object->statut > 0)
+				if (! empty($conf->facture->enabled) && $object->statut > Fichinter::STATUS_DRAFT)
 				{
 					$langs->load("bills");
-					if ($object->statut < 2)
+					if ($object->statut < Fichinter::STATUS_BILLED)
 					{
 						if ($user->rights->facture->creer) print '<div class="inline-block divButAction"><a class="butAction" href="'.DOL_URL_ROOT.'/compta/facture/card.php?action=create&amp;origin='.$object->element.'&amp;originid='.$object->id.'&amp;socid='.$object->socid.'">'.$langs->trans("AddBill").'</a></div>';
 						else print '<div class="inline-block divButAction"><a class="butActionRefused" href="#" title="'.$langs->trans("NotEnoughPermissions").'">'.$langs->trans("AddBill").'</a></div>';
@@ -1640,7 +1640,7 @@ else if ($id > 0 || ! empty($ref))
 
 					if (! empty($conf->global->FICHINTER_CLASSIFY_BILLED))    // Option deprecated. In a future, billed must be managed with a dedicated field to 0 or 1
 					{
-						if ($object->statut != 2)
+						if ($object->statut != Fichinter::STATUS_BILLED)
 						{
 							print '<div class="inline-block divButAction"><a class="butAction" href="'.$_SERVER["PHP_SELF"].'?id='.$object->id.'&amp;action=classifybilled">'.$langs->trans("InterventionClassifyBilled").'</a></div>';
 						}
@@ -1652,7 +1652,7 @@ else if ($id > 0 || ! empty($ref))
 				}
 
 				// Done
-            	if (empty($conf->global->FICHINTER_CLASSIFY_BILLED) && $object->statut > 0 && $object->statut < 3)
+            	if (empty($conf->global->FICHINTER_CLASSIFY_BILLED) && $object->statut > Fichinter::STATUS_DRAFT && $object->statut < Fichinter::STATUS_CLOSED)
 				{
 					print '<div class="inline-block divButAction"><a class="butAction" href="'.$_SERVER["PHP_SELF"].'?id='.$object->id.'&amp;action=classifydone">'.$langs->trans("InterventionClassifyDone").'</a></div>';
 				}
@@ -1663,7 +1663,7 @@ else if ($id > 0 || ! empty($ref))
 				}
 
 				// Delete
-				if (($object->statut == 0 && $user->rights->ficheinter->creer) || $user->rights->ficheinter->supprimer)
+				if (($object->statut == Fichinter::STATUS_DRAFT && $user->rights->ficheinter->creer) || $user->rights->ficheinter->supprimer)
 				{
 					print '<div class="inline-block divButAction"><a class="butActionDelete" href="'.$_SERVER["PHP_SELF"].'?id='.$object->id.'&amp;action=delete"';
 					print '>'.$langs->trans('Delete').'</a></div>';
diff --git a/htdocs/fichinter/class/fichinter.class.php b/htdocs/fichinter/class/fichinter.class.php
index 6142d87de7a..eaf10c357e4 100644
--- a/htdocs/fichinter/class/fichinter.class.php
+++ b/htdocs/fichinter/class/fichinter.class.php
@@ -39,7 +39,7 @@ class Fichinter extends CommonObject
 	public $fk_element='fk_fichinter';
 	public $table_element_line='fichinterdet';
     public $picto = 'intervention';
-    
+
 	/**
 	 * {@inheritdoc}
 	 */
@@ -62,6 +62,23 @@ class Fichinter extends CommonObject
 
 	var $lines = array();
 
+	/**
+	 * Draft status
+	 */
+	const STATUS_DRAFT = 0;
+	/**
+	 * Validated status
+	 */
+	const STATUS_VALIDATED = 1;
+	/**
+	 * Billed
+	 */
+	const STATUS_BILLED = 2;
+	/**
+	 * Closed
+	 */
+	const STATUS_CLOSED = 3;
+
 	/**
 	 *	Constructor
 	 *
@@ -361,7 +378,7 @@ class Fichinter extends CommonObject
 				$this->fk_contrat	= $obj->fk_contrat;
 
 				$this->user_creation= $obj->fk_user_author;
-				
+
 				$this->extraparams	= (array) json_decode($obj->extraparams, true);
 
 				if ($this->statut == 0) $this->brouillon = 1;
@@ -546,23 +563,23 @@ class Fichinter extends CommonObject
 	 */
 	function getAmount() {
 		global $db;
-		
+
 		$amount = 0;
-		
+
 		$this->author = new User($db);
 		$this->author->fetch($this->user_creation);
-		
+
 		$thm = $this->author->thm;
-		
+
 		foreach($this->lines as &$line) {
-			
+
 			$amount+=$line->qty * $thm;
-			
+
 		}
-		
+
 		return $amount;
 	}
-	
+
 	/**
 	 *	Returns the label status
 	 *
@@ -599,7 +616,7 @@ class Fichinter extends CommonObject
 			return '<span class="hideonsmartphone">'.$langs->trans($this->statuts_short[$statut]).' </span>'.img_picto($langs->trans($this->statuts[$statut]),$this->statuts_logo[$statut]);
 		if ($mode == 6)
 		    return '<span class="hideonsmartphone">'.$langs->trans($this->statuts[$statut]).' </span>'.img_picto($langs->trans($this->statuts[$statut]),$this->statuts_logo[$statut]);
-		
+
 		return '';
 	}
 
@@ -949,7 +966,7 @@ class Fichinter extends CommonObject
 		return -2;
 	}
 
-	
+
 
     /**
      *	Load an object from its id and create a new one in database
@@ -1001,7 +1018,7 @@ class Fichinter extends CommonObject
         $this->date_creation      = '';
         $this->date_validation    = '';
         $this->ref_client         = '';
-		
+
         // Create clone
         $result=$this->create($user);
         if ($result < 0) $error++;
@@ -1013,7 +1030,7 @@ class Fichinter extends CommonObject
             {
             	$this->addline($user, $this->id, $line->desc, $line->datei, $line->duration);
             }
-            
+
         	// Hook of thirdparty module
             if (is_object($hookmanager))
             {
@@ -1043,8 +1060,8 @@ class Fichinter extends CommonObject
             return -1;
         }
     }
-	
-	
+
+
 	/**
 	 *	Adding a line of intervention into data base
 	 *