diff --git a/htdocs/comm/propal.php b/htdocs/comm/propal.php
index 0cff46ff37b..0d2189d28b1 100644
--- a/htdocs/comm/propal.php
+++ b/htdocs/comm/propal.php
@@ -1281,7 +1281,7 @@ if ($id > 0 || ! empty($ref))
 	print '</td><td colspan="3">';
 	if ($_GET['action'] == 'editavailability')
 	{
-		$html->form_availability($_SERVER['PHP_SELF'].'?id='.$object->id,$object->fk_availability,'availability');
+		$html->form_availability($_SERVER['PHP_SELF'].'?id='.$object->id,$object->fk_availability,'fk_availability');
 	}
 	else
 	{
diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 72207253463..53fa0c2f50d 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -47,6 +47,7 @@ class Form
     // Cache arrays
     var $cache_types_paiements=array();
     var $cache_conditions_paiements=array();
+    var $cache_availability=array();
 
     var $tva_taux_value;
     var $tva_taux_libelle;
diff --git a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
index b6f5a9abdba..6cd9ab70e0f 100755
--- a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
+++ b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
@@ -55,3 +55,7 @@ create table llx_c_availability
 ALTER TABLE llx_propal ADD COLUMN fk_availability integer DEFAULT 0 AFTER fk_adresse_livraison;
 ALTER TABLE llx_propal CHANGE COLUMN delivery fk_availability integer DEFAULT 0;
 ALTER TABLE llx_availability CHANGE COLUMN libelle label varchar(60) NOT NULL;
+INSERT INTO llx_c_availability (rowid,code,label,active) VALUES (1, 'DSP', 'Disponible', 1);
+INSERT INTO llx_c_availability (rowid,code,label,active) VALUES (2, 'USM', 'Une semaine', 1);
+INSERT INTO llx_c_availability (rowid,code,label,active) VALUES (3, 'DSM', 'Deux semaines', 1);
+INSERT INTO llx_c_availability (rowid,code,label,active) VALUES (4, 'TSM', 'Trois semaines', 1);