diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 032aa80ff2..9ed3d32c57 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -1993,10 +1993,15 @@ def get_reference_details(reference_doctype, reference_name, party_account_curre
 		if not total_amount:
 			if party_account_currency == company_currency:
 				# for handling cases that don't have multi-currency (base field)
-				total_amount = ref_doc.get("base_grand_total") or ref_doc.get("grand_total")
+				total_amount = (
+					ref_doc.get("base_rounded_total")
+					or ref_doc.get("rounded_total")
+					or ref_doc.get("base_grand_total")
+					or ref_doc.get("grand_total")
+				)
 				exchange_rate = 1
 			else:
-				total_amount = ref_doc.get("grand_total")
+				total_amount = ref_doc.get("rounded_total") or ref_doc.get("grand_total")
 		if not exchange_rate:
 			# Get the exchange rate from the original ref doc
 			# or get it based on the posting date of the ref doc.
diff --git a/erpnext/accounts/doctype/payment_entry/test_payment_entry.py b/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
index c8bf6644a5..edfec41918 100644
--- a/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
@@ -1244,6 +1244,24 @@ class TestPaymentEntry(FrappeTestCase):
 		template.allocate_payment_based_on_payment_terms = 1
 		template.save()
 
+	def test_allocation_validation_for_sales_order(self):
+		so = make_sales_order(do_not_save=True)
+		so.items[0].rate = 99.55
+		so.save().submit()
+		self.assertGreater(so.rounded_total, 0.0)
+		pe = get_payment_entry("Sales Order", so.name, bank_account="_Test Cash - _TC")
+		pe.paid_from = "Debtors - _TC"
+		pe.paid_amount = 45.55
+		pe.references[0].allocated_amount = 45.55
+		pe.save().submit()
+		pe = get_payment_entry("Sales Order", so.name, bank_account="_Test Cash - _TC")
+		pe.paid_from = "Debtors - _TC"
+		# No validation error should be thrown here.
+		pe.save().submit()
+
+		so.reload()
+		self.assertEqual(so.advance_paid, so.rounded_total)
+
 
 def create_payment_entry(**args):
 	payment_entry = frappe.new_doc("Payment Entry")