test: Update exchange rate in test cases
diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 16b4720..a991c06 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -58,6 +58,7 @@
 		self.set_amounts()
 		self.validate_amounts()
 		self.apply_taxes()
+		self.set_amounts_after_tax()
 		self.clear_unallocated_reference_document_rows()
 		self.validate_payment_against_negative_invoice()
 		self.validate_transaction_reference()
@@ -477,7 +478,6 @@
 	def set_amounts(self):
 		self.set_received_amount()
 		self.set_amounts_in_company_currency()
-		self.set_amounts_after_tax()
 		self.set_total_allocated_amount()
 		self.set_unallocated_amount()
 		self.set_difference_amount()
@@ -492,6 +492,8 @@
 
 	def set_received_amount(self):
 		self.base_received_amount = self.base_paid_amount
+		if self.paid_from_account_currency == self.paid_to_account_currency:
+			self.received_amount = self.paid_amount
 
 	def set_amounts_after_tax(self):
 		applicable_tax = 0
diff --git a/erpnext/accounts/doctype/payment_entry/test_payment_entry.py b/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
index d1302f5..420e858 100644
--- a/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/test_payment_entry.py
@@ -107,7 +107,7 @@
 		pe = get_payment_entry("Sales Invoice", si.name, bank_account="_Test Bank USD - _TC")
 		pe.reference_no = "1"
 		pe.reference_date = "2016-01-01"
-		pe.target_exchange_rate = 50
+		pe.source_exchange_rate = 50
 		pe.insert()
 		pe.submit()
 
@@ -154,7 +154,7 @@
 		pe = get_payment_entry("Sales Invoice", si.name, bank_account="_Test Bank USD - _TC")
 		pe.reference_no = "1"
 		pe.reference_date = "2016-01-01"
-		pe.target_exchange_rate = 50
+		pe.source_exchange_rate = 50
 		pe.insert()
 		pe.submit()
 
@@ -463,7 +463,7 @@
 		pe = get_payment_entry("Sales Invoice", si.name, bank_account="_Test Bank USD - _TC")
 		pe.reference_no = "1"
 		pe.reference_date = "2016-01-01"
-		pe.target_exchange_rate = 55
+		pe.source_exchange_rate = 55
 
 		pe.append("deductions", {
 			"account": "_Test Exchange Gain/Loss - _TC",
diff --git a/erpnext/accounts/utils.py b/erpnext/accounts/utils.py
index 0d3aa8f..73e2c2e 100644
--- a/erpnext/accounts/utils.py
+++ b/erpnext/accounts/utils.py
@@ -19,6 +19,7 @@
 
 class StockValueAndAccountBalanceOutOfSync(frappe.ValidationError): pass
 class FiscalYearError(frappe.ValidationError): pass
+class PaymentEntryUnlinkError(frappe.ValidationError): pass
 
 @frappe.whitelist()
 def get_fiscal_year(date=None, fiscal_year=None, label="Date", verbose=1, company=None, as_dict=False):
@@ -555,15 +556,14 @@
 		for pe in linked_pe:
 			try:
 				pe_doc = frappe.get_doc("Payment Entry", pe)
-				pe_doc.set_total_allocated_amount()
-				pe_doc.set_unallocated_amount()
+				pe_doc.set_amounts()
 				pe_doc.clear_unallocated_reference_document_rows()
 				pe_doc.validate_payment_type_with_outstanding()
 			except Exception as e:
 				msg = _("There were issues unlinking payment entry {0}.").format(pe_doc.name)
 				msg += '<br>'
 				msg += _("Please cancel payment entry manually first")
-				frappe.throw(msg, title=_("Payment Unlink Error"))
+				frappe.throw(msg, exc=PaymentEntryUnlinkError, title=_("Payment Unlink Error"))
 
 			frappe.db.sql("""update `tabPayment Entry` set total_allocated_amount=%s,
 				base_total_allocated_amount=%s, unallocated_amount=%s, modified=%s, modified_by=%s