fix(patch): updates maintenance schedule field for old docs
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index ee9060b..937465b 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -313,4 +313,5 @@
 erpnext.patches.v13_0.create_pan_field_for_india #2
 erpnext.patches.v14_0.delete_hub_doctypes
 erpnext.patches.v13_0.create_ksa_vat_custom_fields
+erpnext.patches.v13_0.update_maintenance_schedule_field_in_visit
 erpnext.patches.v14_0.migrate_crm_settings