diff --git a/htdocs/comm/propal/contact.php b/htdocs/comm/propal/contact.php
index d5bc7d2b30f..51098f92e65 100644
--- a/htdocs/comm/propal/contact.php
+++ b/htdocs/comm/propal/contact.php
@@ -221,15 +221,7 @@ if ($id > 0)
 
 			print '<td colspan="1">';
 			// On récupère les id des users déjà sélectionnés
-			$userAlreadySelected = array();
-			$tab = $propal->liste_contact(-1,'internal');
-			$num=sizeof($tab);
-			$i = 0;
-			while ($i < $num)
-			{
-				$userAlreadySelected[$i] = $tab[$i]['id'];
-				$i++;
-			}
+			$userAlreadySelected = $propal->getListContactId('internal');
 			$html->select_users($user->id,'contactid',0,$userAlreadySelected);
 			print '</td>';
 			print '<td>';
@@ -260,15 +252,7 @@ if ($id > 0)
 
 			print '<td colspan="1">';
 			// On récupère les id des contacts déjà sélectionnés
-			$contactAlreadySelected = array();
-			$tab = $propal->liste_contact(-1,'external');
-			$num=sizeof($tab);
-			$i = 0;
-			while ($i < $num)
-			{
-				$contactAlreadySelected[$i] = $tab[$i]['id'];
-				$i++;
-			}
+			$contactAlreadySelected = $propal->getListContactId('external');
 			$html->select_contacts($selectedCompany, $selected = '', $htmlname = 'contactid',0,$contactAlreadySelected);
 			print '</td>';
 			print '<td>';
diff --git a/htdocs/commonobject.class.php b/htdocs/commonobject.class.php
index 220579456b3..58765b4a6f2 100644
--- a/htdocs/commonobject.class.php
+++ b/htdocs/commonobject.class.php
@@ -497,6 +497,25 @@ class CommonObject
   {
 	return 1;
   }
+
+  /**
+   *      \brief      On récupère les id de liste_contact
+   *      \param      source      Source du contact external (llx_socpeople) ou internal (llx_user)
+   *      \return     array
+   */
+   function getListContactId($source='external')
+   {
+   	 $contactAlreadySelected = array();
+   	 $tab = $this->liste_contact(-1,$source);
+   	 $num=sizeof($tab);
+   	 $i = 0;
+   	 while ($i < $num)
+   	 {
+   	 	 $contactAlreadySelected[$i] = $tab[$i]['id'];
+   	 	 $i++;
+   	 }
+   	 return $contactAlreadySelected;
+   	}
 }
 
 ?>