diff --git a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
index 1669ca4..7229aff 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
@@ -92,21 +92,19 @@
 
 				if len(invalid_serial_nos):
 					multiple_nos = 's' if len(invalid_serial_nos) > 1 else ''
-					frappe.throw(_("Row #{}: Serial No{}. {} has already been transacted into another POS Invoice. \
-						Please select valid serial no.".format(d.idx, multiple_nos,
-						frappe.bold(', '.join(invalid_serial_nos)))), title=_("Not Available"))
+					frappe.throw(_("Row #{}: Serial No{}. {} has already been transacted into another POS Invoice. Please select valid serial no.").format(
+						d.idx, multiple_nos, frappe.bold(', '.join(invalid_serial_nos))), title=_("Not Available"))
 			else:
 				if allow_negative_stock:
 					return
 
 				available_stock = get_stock_availability(d.item_code, d.warehouse)
 				if not (flt(available_stock) > 0):
-					frappe.throw(_('Row #{}: Item Code: {} is not available under warehouse {}.'
-						.format(d.idx, frappe.bold(d.item_code), frappe.bold(d.warehouse))), title=_("Not Available"))
+					frappe.throw(_('Row #{}: Item Code: {} is not available under warehouse {}.').format(
+						d.idx, frappe.bold(d.item_code), frappe.bold(d.warehouse)), title=_("Not Available"))
 				elif flt(available_stock) < flt(d.qty):
-					frappe.msgprint(_('Row #{}: Stock quantity not enough for Item Code: {} under warehouse {}. \
-						Available quantity {}.'.format(d.idx, frappe.bold(d.item_code),
-						frappe.bold(d.warehouse), frappe.bold(d.qty))), title=_("Not Available"))
+					frappe.msgprint(_('Row #{}: Stock quantity not enough for Item Code: {} under warehouse {}. Available quantity {}.').format(
+						d.idx, frappe.bold(d.item_code), frappe.bold(d.warehouse), frappe.bold(d.qty)), title=_("Not Available"))
 
 	def validate_serialised_or_batched_item(self):
 		for d in self.get("items"):
@@ -117,14 +115,14 @@
 
 
 			if serialized and batched and (no_batch_selected or no_serial_selected):
-				frappe.throw(_('Row #{}: Please select a serial no and batch against item: {} or remove it to complete transaction.'
-						.format(d.idx, frappe.bold(d.item_code))), title=_("Invalid Item"))
+				frappe.throw(_('Row #{}: Please select a serial no and batch against item: {} or remove it to complete transaction.').format(
+					d.idx, frappe.bold(d.item_code)), title=_("Invalid Item"))
 			if serialized and no_serial_selected:
-				frappe.throw(_('Row #{}: No serial number selected against item: {}. Please select one or remove it to complete transaction.'
-						.format(d.idx, frappe.bold(d.item_code))), title=_("Invalid Item"))
+				frappe.throw(_('Row #{}: No serial number selected against item: {}. Please select one or remove it to complete transaction.').format(
+					d.idx, frappe.bold(d.item_code)), title=_("Invalid Item"))
 			if batched and no_batch_selected:
-				frappe.throw(_('Row #{}: No batch selected against item: {}. Please select a batch or remove it to complete transaction.'
-						.format(d.idx, frappe.bold(d.item_code))), title=_("Invalid Item"))
+				frappe.throw(_('Row #{}: No batch selected against item: {}. Please select a batch or remove it to complete transaction.').format(
+					d.idx, frappe.bold(d.item_code)), title=_("Invalid Item"))
 
 	def validate_return_items(self):
 		if not self.get("is_return"): return
@@ -151,7 +149,7 @@
 			self.base_change_amount = flt(self.base_paid_amount - base_grand_total + flt(self.base_write_off_amount))
 
 		if flt(self.change_amount) and not self.account_for_change_amount:
-			msgprint(_("Please enter Account for Change Amount"), raise_exception=1)
+			frappe.msgprint(_("Please enter Account for Change Amount"), raise_exception=1)
 
 	def verify_payment_amount(self):
 		for entry in self.payments:
@@ -167,7 +165,7 @@
 				total_amount_in_payments += payment.amount
 			invoice_total = self.rounded_total or self.grand_total
 			if total_amount_in_payments < invoice_total:
-				frappe.throw(_("Total payments amount can't be greater than {}".format(-invoice_total)))
+				frappe.throw(_("Total payments amount can't be greater than {}").format(-invoice_total))
 
 	def validate_loyalty_transaction(self):
 		if self.redeem_loyalty_points and (not self.loyalty_redemption_account or not self.loyalty_redemption_cost_center):