diff --git a/addons/multi_company/__openerp__.py b/addons/multi_company/__openerp__.py
index baf3a88c32e..beeffc75358 100644
--- a/addons/multi_company/__openerp__.py
+++ b/addons/multi_company/__openerp__.py
@@ -39,7 +39,8 @@ This module is the base module for other multi-company modules.
     ],
     'init_xml': [],
     'update_xml': [
-        'res_company_view.xml'
+        'res_company_view.xml',
+        'multi_company_purchase_sequence.xml',
     ],
     'demo_xml': [
         'multi_company_demo.xml'
diff --git a/addons/multi_company/multi_company_demo.xml b/addons/multi_company/multi_company_demo.xml
index d3b46e6d112..583f83d252d 100644
--- a/addons/multi_company/multi_company_demo.xml
+++ b/addons/multi_company/multi_company_demo.xml
@@ -267,6 +267,32 @@
             <field name="user_id" ref="base.user_root"/>
             <field name="company_id" ref="res_company_oerp_in"/>
         </record>
+        
+        <record id="Shop1_journal_multi_in" model="account.journal">
+            <field name="name">Expenses Journal - (Shop 1)</field>
+            <field name="code">EXJ-Shop 1</field>
+            <field name="type">purchase</field>
+            <field name="view_id" ref="account.account_sp_journal_view"/>
+            <field name="sequence_id" ref="account.sequence_purchase_journal"/>
+            <field model="account.account" name="default_debit_account_id" ref="account.a_expense"/>
+            <field model="account.account" name="default_credit_account_id" ref="account.a_expense"/>
+            <field name="analytic_journal_id" ref="account.exp"/>
+            <field name="user_id" ref="base.user_root"/>
+            <field name="company_id" ref="stock.res_company_shop0"/>
+        </record>
+        
+        <record id="Shop2_journal_multi_in" model="account.journal">
+            <field name="name">Expenses Journal - (Shop 2)</field>
+            <field name="code">EXJ-Shop 2</field>
+            <field name="type">purchase</field>
+            <field name="view_id" ref="account.account_sp_journal_view"/>
+            <field name="sequence_id" ref="account.sequence_purchase_journal"/>
+            <field model="account.account" name="default_debit_account_id" ref="account.a_expense"/>
+            <field model="account.account" name="default_credit_account_id" ref="account.a_expense"/>
+            <field name="analytic_journal_id" ref="account.exp"/>
+            <field name="user_id" ref="base.user_root"/>
+            <field name="company_id" ref="stock.res_company_tinyshop0"/>
+        </record>
 
         <record id="refund_expenses_journal_multi_in" model="account.journal">
             <field name="name">Expenses Credit Notes Journal - (OpenERP IN)</field>
diff --git a/addons/multi_company/multi_company_purchase_sequence.xml b/addons/multi_company/multi_company_purchase_sequence.xml
new file mode 100644
index 00000000000..8205866e573
--- /dev/null
+++ b/addons/multi_company/multi_company_purchase_sequence.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<openerp>
+    <data noupdate="1">
+
+        <!-- Sequence types purchase-->
+        
+        <record id="seq_type_purchase_order_multi_company" model="ir.sequence.type">
+            <field name="name">Purchase Order</field>
+            <field name="code">purchase.order</field>
+        </record>
+
+       <!-- Sequences for Purchase-->
+        
+        <record id="seq_purchase_order_shop1" model="ir.sequence">
+            <field name="name">Purchase Order</field>
+            <field name="code">purchase.order</field>
+            <field name="prefix">PO</field>
+            <field name="padding">5</field>
+            <field name="company_id" ref="stock.res_company_shop0"/>
+        </record>
+        
+        <record id="seq_purchase_order_shop2" model="ir.sequence">
+            <field name="name">Purchase Order</field>
+            <field name="code">purchase.order</field>
+            <field name="prefix">PO</field>
+            <field name="padding">5</field>
+            <field name="company_id" ref="stock.res_company_tinyshop0"/>
+        </record>
+
+    </data>
+</openerp>
diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 6f6ab0c1b44..436ec0b021b 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -228,7 +228,7 @@ class purchase_order(osv.osv):
         'company_id': lambda self,cr,uid,c: self.pool.get('res.company')._company_default_get(cr, uid, 'purchase.order', context=c),
     }
     _sql_constraints = [
-        ('name_uniq', 'unique(name)', 'Order Reference must be unique !'),
+        ('name_uniq', 'unique(name, company_id)', 'Order Reference must be unique !'),
     ]
     _name = "purchase.order"
     _description = "Purchase Order"