diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index fc2cb3c94f08795cb6de2bfb58b23e3461f65feb..d18b49b5294b167184e1f4945af5a71663fa3e29 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -1868,7 +1868,7 @@ class Propal extends CommonObject
             {
             	$this->oldcopy= clone $this;
             	$this->fk_availability = $id;
-            	$this->availability_id = $availability_id;
+            	$this->availability_id = $id;
             }
 
             if (! $notrigger && empty($error))