fix: Cash and non trade discount calculation

(cherry picked from commit 3b15966cc9)

erpnext/controllers/accounts_controller.py

@@ -1109,17 +1109,17 @@ class AccountsController(TransactionBase):
 				frappe.db.get_single_value("Selling Settings", "enable_discount_accounting")
 			)
 
+		if self.doctype == "Purchase Invoice":
+			dr_or_cr = "credit"
+			rev_dr_cr = "debit"
+			supplier_or_customer = self.supplier
+
+		else:
+			dr_or_cr = "debit"
+			rev_dr_cr = "credit"
+			supplier_or_customer = self.customer
+
 		if enable_discount_accounting:
-			if self.doctype == "Purchase Invoice":
-				dr_or_cr = "credit"
-				rev_dr_cr = "debit"
-				supplier_or_customer = self.supplier
-
-			else:
-				dr_or_cr = "debit"
-				rev_dr_cr = "credit"
-				supplier_or_customer = self.customer
-
 			for item in self.get("items"):
 				if item.get("discount_amount") and item.get("discount_account"):
 					discount_amount = item.discount_amount * item.qty
@@ -1173,18 +1173,22 @@ class AccountsController(TransactionBase):
 						)
 					)
 
-			if self.get("discount_amount") and self.get("additional_discount_account"):
-				gl_entries.append(
-					self.get_gl_dict(
-						{
-							"account": self.additional_discount_account,
-							"against": supplier_or_customer,
-							dr_or_cr: self.discount_amount,
-							"cost_center": self.cost_center,
-						},
-						item=self,
-					)
+		if (
+			(enable_discount_accounting or self.is_cash_or_non_trade_discount)
+			and self.get("additional_discount_account")
+			and self.get("discount_amount")
+		):
+			gl_entries.append(
+				self.get_gl_dict(
+					{
+						"account": self.additional_discount_account,
+						"against": supplier_or_customer,
+						dr_or_cr: self.discount_amount,
+						"cost_center": self.cost_center,
+					},
+					item=self,
 				)
+			)
 
 	def validate_multiple_billing(self, ref_dt, item_ref_dn, based_on, parentfield):
 		from erpnext.controllers.status_updater import get_allowance_for

erpnext/controllers/taxes_and_totals.py

@@ -37,6 +37,11 @@ class calculate_taxes_and_totals(object):
 			self.set_discount_amount()
 			self.apply_discount_amount()
 
+		# Update grand total as per cash and non trade discount
+		if self.doc.apply_discount_on == "Grand Total" and self.doc.get("is_cash_or_non_trade_discount"):
+			self.doc.grand_total -= self.doc.discount_amount
+			self.doc.base_grand_total -= self.doc.base_discount_amount
+
 		self.calculate_shipping_charges()
 
 		if self.doc.doctype in ["Sales Invoice", "Purchase Invoice"]:
@@ -500,9 +505,6 @@ class calculate_taxes_and_totals(object):
 		else:
 			self.doc.grand_total = flt(self.doc.net_total)
 
-		if self.doc.apply_discount_on == "Grand Total" and self.doc.get("is_cash_or_non_trade_discount"):
-			self.doc.grand_total -= self.doc.discount_amount
-
 		if self.doc.get("taxes"):
 			self.doc.total_taxes_and_charges = flt(
 				self.doc.grand_total - self.doc.net_total - flt(self.doc.rounding_adjustment),
@@ -597,16 +599,16 @@ class calculate_taxes_and_totals(object):
 			if not self.doc.apply_discount_on:
 				frappe.throw(_("Please select Apply Discount On"))
 
+			self.doc.base_discount_amount = flt(
+				self.doc.discount_amount * self.doc.conversion_rate, self.doc.precision("base_discount_amount")
+			)
+
 			if self.doc.apply_discount_on == "Grand Total" and self.doc.get(
 				"is_cash_or_non_trade_discount"
 			):
 				self.discount_amount_applied = True
 				return
 
-			self.doc.base_discount_amount = flt(
-				self.doc.discount_amount * self.doc.conversion_rate, self.doc.precision("base_discount_amount")
-			)
-
 			total_for_discount_amount = self.get_total_for_discount_amount()
 			taxes = self.doc.get("taxes")
 			net_total = 0