diff --git a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
index 7c5ca86a7a64..b4ba68768457 100644
--- a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
@@ -4175,6 +4175,25 @@ def test_invoice_remarks(self):
 		si.submit()
 		self.assertEqual(si.remarks, f"Against Customer Order Test PO dated {format_date(nowdate())}")
 
+	def test_gl_voucher_subtype(self):
+		si = create_sales_invoice()
+		gl_entries = frappe.get_all(
+			"GL Entry",
+			filters={"voucher_type": "Sales Invoice", "voucher_no": si.name},
+			pluck="voucher_subtype",
+		)
+
+		self.assertTrue(all([x == "Sales Invoice" for x in gl_entries]))
+
+		si = create_sales_invoice(is_return=1, qty=-1)
+		gl_entries = frappe.get_all(
+			"GL Entry",
+			filters={"voucher_type": "Sales Invoice", "voucher_no": si.name},
+			pluck="voucher_subtype",
+		)
+
+		self.assertTrue(all([x == "Credit Note" for x in gl_entries]))
+
 
 def set_advance_flag(company, flag, default_account):
 	frappe.db.set_value(
diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index c65456f48a0e..bf5770859b5a 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -1102,9 +1102,11 @@ def get_voucher_subtype(self):
 			return "Purchase Return"
 		elif self.doctype == "Delivery Note" and self.is_return:
 			return "Sales Return"
-		elif (self.doctype == "Sales Invoice" and self.is_return) or self.doctype == "Purchase Invoice":
+		elif self.doctype == "Sales Invoice" and self.is_return:
 			return "Credit Note"
-		elif (self.doctype == "Purchase Invoice" and self.is_return) or self.doctype == "Sales Invoice":
+		elif self.doctype == "Sales Invoice" and self.is_debit_note:
+			return "Debit Note"
+		elif self.doctype == "Purchase Invoice" and self.is_return:
 			return "Debit Note"
 
 		return self.doctype
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 54086cc2b138..4d744122b479 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -385,5 +385,6 @@ erpnext.patches.v15_0.set_standard_stock_entry_type
 erpnext.patches.v15_0.set_difference_amount_in_asset_value_adjustment
 erpnext.patches.v15_0.link_purchase_item_to_asset_doc
 erpnext.patches.v15_0.migrate_to_utm_analytics
+erpnext.patches.v15_0.update_sub_voucher_type_in_gl_entries
 erpnext.patches.v15_0.update_task_assignee_email_field_in_asset_maintenance_log
 erpnext.patches.v14_0.update_currency_exchange_settings_for_frankfurter
diff --git a/erpnext/patches/v15_0/update_sub_voucher_type_in_gl_entries.py b/erpnext/patches/v15_0/update_sub_voucher_type_in_gl_entries.py
new file mode 100644
index 000000000000..7160a6ba87d9
--- /dev/null
+++ b/erpnext/patches/v15_0/update_sub_voucher_type_in_gl_entries.py
@@ -0,0 +1,57 @@
+import frappe
+
+
+def execute():
+	update_purchase_invoices()
+	update_sales_invoices()
+	update_sales_debit_notes()
+
+
+def update_purchase_invoices():
+	invoices = frappe.get_all(
+		"Purchase Invoice",
+		filters={"docstatus": 1, "is_return": 0},
+		pluck="name",
+	)
+
+	if not invoices:
+		return
+
+	update_gl_entry(doctype="Purchase Invoice", invoices=invoices, value="Purchase Invoice")
+
+
+def update_sales_invoices():
+	invoices = frappe.get_all(
+		"Sales Invoice",
+		filters={"docstatus": 1, "is_return": 0, "is_debit_note": 0},
+		pluck="name",
+	)
+	if not invoices:
+		return
+
+	update_gl_entry(doctype="Sales Invoice", invoices=invoices, value="Sales Invoice")
+
+
+def update_sales_debit_notes():
+	invoices = frappe.get_all(
+		"Sales Invoice",
+		filters={"docstatus": 1, "is_debit_note": 1},
+		pluck="name",
+	)
+
+	if not invoices:
+		return
+
+	update_gl_entry(doctype="Sales Invoice", invoices=invoices, value="Debit Note")
+
+
+def update_gl_entry(doctype, invoices, value):
+	gl_entry = frappe.qb.DocType("GL Entry")
+	(
+		frappe.qb.update(gl_entry)
+		.set("voucher_subtype", value)
+		.where(gl_entry.voucher_subtype.isnotnull())
+		.where(gl_entry.voucher_no.isin(invoices))
+		.where(gl_entry.voucher_type == doctype)
+		.run()
+	)