diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 288acd9f792..730c47569fa 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -90,7 +90,7 @@ class SalesInvoice(SellingController):
 		super(SalesInvoice, self).validate()
 		self.validate_auto_set_posting_time()
 
-		if not self.is_pos:
+		if not (self.is_pos or self.is_debit_note):
 			self.so_dn_required()
 
 		self.set_tax_withholding()
diff --git a/erpnext/controllers/selling_controller.py b/erpnext/controllers/selling_controller.py
index c9b12f4f723..34abe9f764f 100644
--- a/erpnext/controllers/selling_controller.py
+++ b/erpnext/controllers/selling_controller.py
@@ -31,7 +31,8 @@ class SellingController(StockController):
 	def validate(self):
 		super(SellingController, self).validate()
 		self.validate_items()
-		self.validate_max_discount()
+		if not self.get("is_debit_note"):
+			self.validate_max_discount()
 		self.validate_selling_price()
 		self.set_qty_as_per_stock_uom()
 		self.set_po_nos(for_validate=True)