fix(pos): use company-currency change amount when netting pos gl entries (backport #58599) (#58678)

Co-authored-by: Vishnu Priya Baskaran <145791817+ervishnucs@users.noreply.github.com>

erpnext/accounts/doctype/sales_invoice/sales_invoice.py

@@ -1877,7 +1877,7 @@ class SalesInvoice(SellingController):
 
 			for payment_mode in self.payments:
 				if skip_change_gl_entries and payment_mode.account == self.account_for_change_amount:
-					payment_mode.base_amount -= flt(self.change_amount)
+					payment_mode.base_amount -= flt(self.base_change_amount)
 
 				against_voucher = self.name
 				if self.is_return and self.return_against and not self.update_outstanding_for_self:

erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py

@@ -1484,6 +1484,33 @@ class TestSalesInvoice(ERPNextTestSuite):
 
 		frappe.db.set_single_value("POS Settings", "post_change_gl_entries", 1)
 
+	def test_pos_change_amount_multi_currency_gl_entry(self):
+		frappe.db.set_single_value("POS Settings", "post_change_gl_entries", 0)
+
+		si = create_sales_invoice(do_not_save=True)
+		si.is_pos = 1
+		si.currency = "USD"
+		si.conversion_rate = 50
+		si.party_account_currency = "USD"
+		si.account_for_change_amount = "Cash - _TC"
+		si.change_amount = 50
+		si.base_change_amount = 2500
+		si.append(
+			"payments",
+			{"mode_of_payment": "Cash", "account": "Cash - _TC", "amount": 150, "base_amount": 7500},
+		)
+
+		gl_entries = []
+		si.make_pos_gl_entries(gl_entries)
+
+		debtors_entry = next(entry for entry in gl_entries if entry["account"] == si.debit_to)
+		cash_entry = next(entry for entry in gl_entries if entry["account"] == "Cash - _TC")
+
+		self.assertEqual(flt(debtors_entry["credit"]), 5000.0)
+		self.assertEqual(flt(cash_entry["debit"]), 5000.0)
+
+		frappe.db.set_single_value("POS Settings", "post_change_gl_entries", 1)
+
 	def validate_pos_gl_entry(self, si, pos, cash_amount, validate_without_change_gle=False):
 		if validate_without_change_gle:
 			cash_amount -= pos.change_amount