diff --git a/htdocs/mrp/mo_list.php b/htdocs/mrp/mo_list.php
index 4e6f33109f0..3793126fb0b 100644
--- a/htdocs/mrp/mo_list.php
+++ b/htdocs/mrp/mo_list.php
@@ -230,6 +230,8 @@ $sql .= " FROM ".MAIN_DB_PREFIX.$object->table_element." as t";
 if (isset($extrafields->attributes[$object->table_element]['label']) && is_array($extrafields->attributes[$object->table_element]['label']) && count($extrafields->attributes[$object->table_element]['label'])) {
 	$sql .= " LEFT JOIN ".MAIN_DB_PREFIX.$object->table_element."_extrafields as ef on (t.rowid = ef.fk_object)";
 }
+$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."mrp_production lineparent ON t.fk_parent_line = lineparent.rowid";
+$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."mrp_mo moparent ON lineparent.fk_mo = moparent.rowid";
 // Add table from hooks
 $parameters = array();
 $reshook = $hookmanager->executeHooks('printFieldListFrom', $parameters, $object); // Note that $action and $object may have been modified by hook
@@ -239,11 +241,16 @@ if ($object->ismultientitymanaged == 1) {
 } else {
 	$sql .= " WHERE 1 = 1";
 }
+
 foreach ($search as $key => $val) {
 	if (array_key_exists($key, $object->fields)) {
 		if ($key == 'status' && $search[$key] == -1) {
 			continue;
 		}
+		if($key == 'fk_parent_line'){
+			$sql .= natural_search('moparent.ref', $search[$key], 0);
+			continue;
+		}
 		$mode_search = (($object->isInt($object->fields[$key]) || $object->isFloat($object->fields[$key])) ? 1 : 0);
 		if ((strpos($object->fields[$key]['type'], 'integer:') === 0) || (strpos($object->fields[$key]['type'], 'sellist:') === 0) || !empty($object->fields[$key]['arrayofkeyval'])) {
 			if ($search[$key] == '-1' || ($search[$key] === '0' && (empty($object->fields[$key]['arrayofkeyval']) || !array_key_exists('0', $object->fields[$key]['arrayofkeyval'])))) {
@@ -461,9 +468,11 @@ foreach ($object->fields as $key => $val) {
 	}
 	if (!empty($arrayfields['t.'.$key]['checked'])) {
 		print '<td class="liste_titre'.($cssforfield ? ' '.$cssforfield : '').'">';
-		//      if($key == 'fk_parent_line'){
-		//          print '<input type="text" class="flat maxwidth75" name="search_fk_parent_line" value="">';
-		//      }
+		if($key == 'fk_parent_line'){
+			print '<input type="text" class="flat maxwidth75" name="search_fk_parent_line">';
+			print '</td>';
+			continue;
+		}
 		if (!empty($val['arrayofkeyval']) && is_array($val['arrayofkeyval'])) {
 			print $form->selectarray('search_'.$key, $val['arrayofkeyval'], (isset($search[$key]) ? $search[$key] : ''), $val['notnull'], 0, 0, '', 1, 0, 0, '', 'maxwidth100', 1);
 		} elseif ((strpos($val['type'], 'integer:') === 0) || (strpos($val['type'], 'sellist:') === 0)) {