diff --git a/patches/patch.py b/patches/patch.py
index b4116b5..9a2bb83 100644
--- a/patches/patch.py
+++ b/patches/patch.py
@@ -1,7 +1,7 @@
 # REMEMBER to update this
 # ========================
 
-last_patch = 342
+last_patch = 343
 
 #-------------------------------------------
 
@@ -1423,3 +1423,5 @@
 			ch.save(1)
 	elif patch_no == 342:
 		sql("update `tabDocField` set permlevel = 0 where parent = 'Stock Entry Detail' and fieldname in ('s_warehouse', 't_warehouse', 'fg_item')")
+	elif patch_no == 343:
+		sql("delete from `tabDocFormat` where ifnull(format, '') = '' and parent = 'Delivery Note'")