diff --git a/erpnext/controllers/sales_and_purchase_return.py b/erpnext/controllers/sales_and_purchase_return.py
index f893a91..ea5116f 100644
--- a/erpnext/controllers/sales_and_purchase_return.py
+++ b/erpnext/controllers/sales_and_purchase_return.py
@@ -223,9 +223,9 @@
 			if doc.doctype == 'Sales Invoice':
 				doc.set('payments', [])
 				for data in source.payments:
-   					paid_amount = 0.00
+					paid_amount = 0.00
 					base_paid_amount = 0.00
-   					data.base_amount = flt(data.amount*source.conversion_rate, source.precision("base_paid_amount"))
+					data.base_amount = flt(data.amount*source.conversion_rate, source.precision("base_paid_amount"))
 					paid_amount += data.amount
 					base_paid_amount += data.base_amount
 					doc.append('payments', {