diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index b90db05..2da63c8 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -685,13 +685,17 @@
 							.format(d.reference_name, d.against_order))
 
 	def set_advance_gain_or_loss(self):
-		if not self.get("advances"):
+		if self.get('conversion_rate') == 1 or not self.get("advances"):
+			return
+
+		is_purchase_invoice = self.doctype == 'Purchase Invoice'
+		party_account = self.credit_to if is_purchase_invoice else self.debit_to
+		if get_account_currency(party_account) != self.currency:
 			return
 
 		for d in self.get("advances"):
 			advance_exchange_rate = d.ref_exchange_rate
-			if (d.allocated_amount and self.conversion_rate != 1
-				and self.conversion_rate != advance_exchange_rate):
+			if (d.allocated_amount and self.conversion_rate != advance_exchange_rate):
 
 				base_allocated_amount_in_ref_rate = advance_exchange_rate * d.allocated_amount
 				base_allocated_amount_in_inv_rate = self.conversion_rate * d.allocated_amount