diff --git a/htdocs/expensereport/card.php b/htdocs/expensereport/card.php
index cb5c475ed1e..d5610c9153a 100644
--- a/htdocs/expensereport/card.php
+++ b/htdocs/expensereport/card.php
@@ -277,10 +277,14 @@ if (empty($reshook)) {
 			}
 		}
 
-		if (!$error && empty($conf->global->EXPENSEREPORT_ALLOW_OVERLAPPING_PERIODS) && $object->periode_existe($fuser, $object->date_debut, $object->date_fin)) {
-			$error++;
-			setEventMessages($langs->trans("ErrorDoubleDeclaration"), null, 'errors');
-			$action = 'create';
+		if (!$error && empty($conf->global->EXPENSEREPORT_ALLOW_OVERLAPPING_PERIODS)) {
+			$overlappingExpenseReportID = $object->periode_existe($fuser, $object->date_debut, $object->date_fin, true);
+
+			if ($overlappingExpenseReportID > 0) {
+				$error++;
+				setEventMessages($langs->trans("ErrorDoubleDeclaration").' <a href="'.$_SERVER['PHP_SELF'].'?id='.$overlappingExpenseReportID.'">'. $langs->trans('ShowTrip').'</a>', null, 'errors');
+				$action = 'create';
+			}
 		}
 
 		if (!$error) {
diff --git a/htdocs/expensereport/class/expensereport.class.php b/htdocs/expensereport/class/expensereport.class.php
index 63303554c51..64034c10a3f 100644
--- a/htdocs/expensereport/class/expensereport.class.php
+++ b/htdocs/expensereport/class/expensereport.class.php
@@ -2213,8 +2213,6 @@ class ExpenseReport extends CommonObject
 				$date_d_form = $date_debut;
 				$date_f_form = $date_fin;
 
-				$existe = false;
-
 				while ($i < $num_rows) {
 					$objp = $this->db->fetch_object($result);
 
@@ -2222,17 +2220,13 @@ class ExpenseReport extends CommonObject
 					$date_f_req = $this->db->jdate($objp->date_fin); // 4
 
 					if (!($date_f_form < $date_d_req || $date_d_form > $date_f_req)) {
-						$existe = true;
+						return $objp->rowid;
 					}
 
 					$i++;
 				}
 
-				if ($existe) {
-					return 1;
-				} else {
-					return 0;
-				}
+				return 0;
 			} else {
 				return 0;
 			}