diff --git a/erpnext/accounts/doctype/pos_profile/test_pos_profile.py b/erpnext/accounts/doctype/pos_profile/test_pos_profile.py
index 58f12162d14..f8d52a78336 100644
--- a/erpnext/accounts/doctype/pos_profile/test_pos_profile.py
+++ b/erpnext/accounts/doctype/pos_profile/test_pos_profile.py
@@ -15,12 +15,12 @@ class TestPOSProfile(unittest.TestCase):
 		pos_profile = get_pos_profile("_Test Company") or {}
 		if pos_profile:
 			doc = frappe.get_doc("POS Profile", pos_profile.get("name"))
-			doc.append('item_groups', {'item_group': '_Test Item Group'})
-			doc.append('customer_groups', {'customer_group': '_Test Customer Group'})
+			doc.set('item_groups', [{'item_group': '_Test Item Group'}])
+			doc.set('customer_groups', [{'customer_group': '_Test Customer Group'}])
 			doc.save()
 			items = get_items_list(doc, doc.company)
 			customers = get_customers_list(doc)
-
+			
 			products_count = frappe.db.sql(""" select count(name) from tabItem where item_group = '_Test Item Group'""", as_list=1)
 			customers_count = frappe.db.sql(""" select count(name) from tabCustomer where customer_group = '_Test Customer Group'""")
 
diff --git a/erpnext/accounts/doctype/sales_invoice/pos.py b/erpnext/accounts/doctype/sales_invoice/pos.py
index c2f79841725..f371bd425c5 100755
--- a/erpnext/accounts/doctype/sales_invoice/pos.py
+++ b/erpnext/accounts/doctype/sales_invoice/pos.py
@@ -189,6 +189,7 @@ def get_items_list(pos_profile, company):
 		where
 			i.disabled = 0 and i.has_variants = 0 and i.is_sales_item = 1
 			{cond}
+		group by i.item_code
 		""".format(cond=cond), tuple([company] + args_list), as_dict=1)