diff --git a/htdocs/projet/card.php b/htdocs/projet/card.php
index 7fddc12b7c9..3b5a0175d03 100644
--- a/htdocs/projet/card.php
+++ b/htdocs/projet/card.php
@@ -1153,11 +1153,14 @@ if ($action == 'create' && $user->rights->projet->creer) {
 		print $form->selectDate($object->date_start ? $object->date_start : -1, 'projectstart', 0, 0, 0, '', 1, 0);
 		print ' <span class="opacitymedium"> '.$langs->trans("to").' </span> ';
 		print $form->selectDate($object->date_end ? $object->date_end : -1, 'projectend', 0, 0, 0, '', 1, 0);
-		print ' &nbsp; &nbsp; <input type="checkbox" class="valignmiddle" id="reportdate" name="reportdate" value="yes" ';
-		if ($comefromclone) {
-			print ' checked ';
+		$object->getLinesArray(null, 0);
+		if (!empty($object->usage_task) && !empty($object->lines)) {
+			print ' <span id="divreportdate" class="hidden">&nbsp; &nbsp; <input type="checkbox" class="valignmiddle" id="reportdate" name="reportdate" value="yes" ';
+			if ($comefromclone) {
+				print ' checked ';
+			}
+			print '/><label for="reportdate" class="opacitymedium">'.$langs->trans("ProjectReportDate").'</label></span>';
 		}
-		print '/><label for="reportdate" class="opacitymedium">'.$langs->trans("ProjectReportDate").'</label>';
 		print '</td></tr>';
 
 		if (isModEnabled('eventorganization')) {
@@ -1379,6 +1382,11 @@ if ($action == 'create' && $user->rights->projet->creer) {
                     jQuery("#usage_task").prop("checked", true);
                 }
         	});
+
+			jQuery("#projectstart").change(function() {
+				console.log("We modify the start date");
+				jQuery("#divreportdate").show();
+			});
         });
         </script>';
 
diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index 582e062f68a..1e4c6862c58 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -2305,11 +2305,11 @@ class Project extends CommonObject
 
 
 	/**
-	 * 	Create an array of tasks of current project
+	 * Create an array of tasks of current project
 	 *
-	 *  @param  User	$user       		Object user we want project allowed to
+	 * @param	User	$user       		Object user we want project allowed to
 	 * @param	int		$loadRoleMode		1= will test Roles on task;  0 used in delete project action
-	 * 	@return int							>0 if OK, <0 if KO
+	 * @return 	int							>0 if OK, <0 if KO
 	 */
 	public function getLinesArray($user, $loadRoleMode = 1)
 	{