diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index ce48737d356eccbda8cc281ef685c4dbc60db447..72bb04feb0a2daad640ee988e051e79e8bc01a95 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -2820,6 +2820,13 @@ def create_dunning(source_name, target_doc=None, ignore_permissions=False):
 				target.closing_text = letter_text.get("closing_text")
 				target.language = letter_text.get("language")
 
+		# update outstanding from doc
+		if source.payment_schedule and len(source.payment_schedule) == 1:
+			for row in target.overdue_payments:
+				if row.payment_schedule == source.payment_schedule[0].name:
+					row.outstanding = source.get("outstanding_amount")
+
+		target.round_floats_in(target)
 		target.validate()
 
 	return get_mapped_doc(