diff --git a/addons/hr_expense/__terp__.py b/addons/hr_expense/__terp__.py
index f21f330df10..fc50f607b2a 100644
--- a/addons/hr_expense/__terp__.py
+++ b/addons/hr_expense/__terp__.py
@@ -9,7 +9,7 @@
 	"init_xml" : [],
 	"demo_xml" : [],
 	#"demo_xml" : ["hr_expense_demo.xml", "hr.expense.expense.csv"],
-	"update_xml" : ["hr_expense_workflow.xml", "hr_expense_view.xml", "hr_expense_report.xml"],
+	"update_xml" : ["hr_expense_sequence.xml", "hr_expense_workflow.xml", "hr_expense_view.xml", "hr_expense_report.xml",],
 	"active": False,
 	"installable": True
 }
diff --git a/addons/hr_expense/hr_expense.py b/addons/hr_expense/hr_expense.py
index bcf569da019..e5c8ac47099 100644
--- a/addons/hr_expense/hr_expense.py
+++ b/addons/hr_expense/hr_expense.py
@@ -135,7 +135,7 @@ class hr_expense_expense(osv.osv):
 			acc = exp.employee_id.address_id.partner_id.property_account_payable[0]
 			inv = {
 				'name': exp.name,
-				'reference': "EMP%dEXP%d" % (exp.employee_id.id, exp.id),
+				'reference': self.pool.get('ir.sequence').get(cr, uid, 'hr.expense.invoice'),
 				'account_id': acc,
 				'type': 'in_invoice',
 				'partner_id': exp.employee_id.address_id.partner_id.id,
@@ -144,8 +144,9 @@ class hr_expense_expense(osv.osv):
 				'origin': exp.name,
 				'invoice_line': lines,
 				'price_type': 'tax_included',
-				'journal_id': exp.journal_id and exp.journal_id.id or False,
 			}
+			if exp.journal_id:
+				inv['journal_id']=exp.journal_id.id
 			inv_id = self.pool.get('account.invoice').create(cr, uid, inv, {'type':'in_invoice'})
 			self.write(cr, uid, [exp.id], {'invoice_id': inv_id, 'state': 'invoiced'})
 			res = inv_id
diff --git a/addons/hr_expense/hr_expense_sequence.xml b/addons/hr_expense/hr_expense_sequence.xml
new file mode 100644
index 00000000000..ad402853eab
--- /dev/null
+++ b/addons/hr_expense/hr_expense_sequence.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<terp>
+	<data noupdate="1">
+		<record model="ir.sequence.type" id="seq_type_hr_expense_invoice">
+			<field name="name">Expense invoice</field>
+			<field name="code">hr.expense.invoice</field>
+		</record>
+		<record model="ir.sequence" id="seq_hr_expense_invoice">
+			<field name="name">Expense invoice</field>
+			<field name="code">hr.expense.invoice</field>
+			<field name="prefix">EXP/</field>
+			<field name="padding">3</field>
+		</record>
+	</data>
+</terp>
diff --git a/addons/hr_expense/hr_expense_workflow.xml b/addons/hr_expense/hr_expense_workflow.xml
index cbffb7cfb67..fc00b362e81 100644
--- a/addons/hr_expense/hr_expense_workflow.xml
+++ b/addons/hr_expense/hr_expense_workflow.xml
@@ -8,6 +8,10 @@
 			<field name="name">Human Resources - Expenses</field>
 		</record>
 
+		<record model="res.roles" id="HR_INV">
+			<field name="name">Human Resources - Expenses invoice</field>
+		</record>
+
 		<!-- Workflow definition -->
 
 		<record model="workflow" id="wkf_expenses">
@@ -100,7 +104,7 @@
 			<field name="act_from" ref="act_accepted" />
 			<field name="act_to" ref="act_invoice" />
 			<field name="signal">invoice</field>
-			<field name="role_id" ref="HR"/>
+			<field name="role_id" ref="HR_INV"/>
 		</record>
 		<record model="workflow.transition" id="t9">
 			<field name="act_from" ref="act_invoice" />