diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 2c0da345e3f..cd8a907c796 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -286,6 +286,8 @@ class AccountInvoice(models.Model):
     partner_id = fields.Many2one('res.partner', string='Partner', change_default=True,
         required=True, readonly=True, states={'draft': [('readonly', False)]},
         track_visibility='always')
+    vendor_bill_id = fields.Many2one('account.invoice', string='Vendor Bill',
+        help="Auto-complete from a past bill.")
     payment_term_id = fields.Many2one('account.payment.term', string='Payment Terms', oldname='payment_term',
         readonly=True, states={'draft': [('readonly', False)]},
         help="If you use payment terms, the due date will be computed automatically at the generation "
@@ -372,6 +374,20 @@ class AccountInvoice(models.Model):
         ('number_uniq', 'unique(number, company_id, journal_id, type)', 'Invoice Number must be unique per Company!'),
     ]
 
+    # Load all Vendor Bill lines
+    @api.onchange('vendor_bill_id')
+    def _onchange_vendor_bill(self):
+        if not self.vendor_bill_id:
+            return {}
+        self.currency_id = self.vendor_bill_id.currency_id
+        new_lines = self.env['account.invoice.line']
+        for line in self.vendor_bill_id.invoice_line_ids:
+            new_lines += new_lines.new(line._prepare_invoice_line())
+        self.invoice_line_ids += new_lines
+        self.payment_term_id = self.vendor_bill_id.payment_term_id
+        self.vendor_bill_id = False
+        return {}
+
     def _get_seq_number_next_stuff(self):
         self.ensure_one()
         journal_sequence = self.journal_id.sequence_id
@@ -1655,6 +1671,23 @@ class AccountInvoiceLine(models.Model):
             raise UserError(_('You can only delete an invoice line if the invoice is in draft state.'))
         return super(AccountInvoiceLine, self).unlink()
 
+    def _prepare_invoice_line(self):
+        data = {
+            'name': self.name,
+            'origin': self.origin,
+            'uom_id': self.uom_id.id,
+            'product_id': self.product_id.id,
+            'account_id': self.account_id.id,
+            'price_unit': self.price_unit,
+            'quantity': self.quantity,
+            'discount': self.discount,
+            'account_analytic_id': self.account_analytic_id.id,
+            'analytic_tag_ids': self.analytic_tag_ids.ids,
+            'invoice_line_tax_ids': self.invoice_line_tax_ids.ids
+        }
+        return data
+
+
 class AccountInvoiceTax(models.Model):
     _name = "account.invoice.tax"
     _description = "Invoice Tax"
diff --git a/addons/account/views/account_invoice_view.xml b/addons/account/views/account_invoice_view.xml
index 1eaf678e93e..33a5c8579a7 100644
--- a/addons/account/views/account_invoice_view.xml
+++ b/addons/account/views/account_invoice_view.xml
@@ -238,7 +238,7 @@
                         <label string="Bill " attrs="{'invisible': ['|',('state', '=', 'draft'), ('type','!=','in_invoice')]}"/>
                         <label string="Credit Note " attrs="{'invisible': ['|',('state', '=', 'draft'), ('type','!=','in_refund')]}"/>
                         <h1 class="mt0">
-                            <field name="number" class="oe_inline"  attrs="{'invisible': [('state', '=', 'draft')]}"/>
+                            <field name="number" class="oe_inline" attrs="{'invisible': [('state', '=', 'draft')]}"/>
                             <div  attrs="{'invisible': [('sequence_number_next_prefix','=',False)]}">
                                 <field name="sequence_number_next_prefix" class="oe_inline"/>
                                 <field name="sequence_number_next" class="oe_inline"/>
@@ -252,6 +252,10 @@
                               context="{'default_customer': 0, 'search_default_supplier': 1, 'default_supplier': 1, 'default_company_type': 'company'}"
                               domain="[('supplier', '=', True)]"/>
                             <field name="reference" string="Vendor Reference"/>
+                            <field name="vendor_bill_id" attrs="{'invisible': [('state','not in',['draft'])]}"
+                              domain="[('partner_id','child_of', [partner_id]), ('state','in',('open','paid')), ('type','=','in_invoice')]"
+                              string="Auto-Complete" placeholder="Select an old vendor bill"
+                              options="{'no_create': True}" context="{'show_total_amount': True}"/>
                         </group>
                         <group>
                             <field name="origin" attrs="{'invisible': [('origin', '=', False)]}"/>
diff --git a/addons/purchase/models/__init__.py b/addons/purchase/models/__init__.py
index 668d20cc290..d0ec983e287 100644
--- a/addons/purchase/models/__init__.py
+++ b/addons/purchase/models/__init__.py
@@ -3,6 +3,7 @@
 
 from . import account_invoice
 from . import purchase
+from . import purchase_bill
 from . import res_company
 from . import res_config_settings
 from . import res_partner
diff --git a/addons/purchase/models/account_invoice.py b/addons/purchase/models/account_invoice.py
index 33ef682f3d9..025baa47282 100644
--- a/addons/purchase/models/account_invoice.py
+++ b/addons/purchase/models/account_invoice.py
@@ -4,16 +4,14 @@
 from odoo import api, fields, models, _
 from odoo.tools.float_utils import float_compare
 
-from odoo.exceptions import UserError
 
 class AccountInvoice(models.Model):
     _inherit = 'account.invoice'
-
     purchase_id = fields.Many2one(
         comodel_name='purchase.order',
         string='Add Purchase Order',
         readonly=True, states={'draft': [('readonly', False)]},
-        help='Encoding help. When selected, the associated purchase order lines are added to the vendor bill. Several PO can be selected.'
+        help='Load the vendor bill based on selected purchase order. Several PO can be selected.'
     )
 
     @api.onchange('state', 'partner_id', 'invoice_line_ids')
@@ -29,7 +27,7 @@ class AccountInvoice(models.Model):
         purchase_ids = self.invoice_line_ids.mapped('purchase_id').filtered(lambda r: r.order_line <= purchase_line_ids)
 
         result['domain'] = {'purchase_id': [
-            ('invoice_status', '=', 'to invoice'),
+            ('invoice_status', 'in', ['to invoice', 'no']),
             ('partner_id', 'child_of', self.partner_id.id),
             ('id', 'not in', purchase_ids.ids),
             ]}
@@ -48,7 +46,7 @@ class AccountInvoice(models.Model):
         date = self.date_invoice
         data = {
             'purchase_line_id': line.id,
-            'name': line.order_id.name+': '+line.name,
+            'name': line.order_id.name + ': ' + line.name,
             'origin': line.order_id.origin,
             'uom_id': line.product_uom.id,
             'product_id': line.product_id.id,
@@ -243,7 +241,7 @@ class AccountInvoice(models.Model):
         invoice = super(AccountInvoice, self).create(vals)
         purchase = invoice.invoice_line_ids.mapped('purchase_line_id.order_id')
         if purchase and not invoice.refund_invoice_id:
-            message = _("This vendor bill has been created from: %s") % (",".join(["<a href=# data-oe-model=purchase.order data-oe-id="+str(order.id)+">"+order.name+"</a>" for order in purchase]))
+            message = _("This vendor bill has been created from: %s") % (",".join(["<a href=# data-oe-model=purchase.order data-oe-id=" + str(order.id) + ">" + order.name + "</a>" for order in purchase]))
             invoice.message_post(body=message)
         return invoice
 
@@ -257,7 +255,7 @@ class AccountInvoice(models.Model):
             #To get all po reference when updating invoice line or adding purchase order reference from vendor bill.
             purchase = (purchase_old | purchase_new) - (purchase_old & purchase_new)
             if purchase:
-                message = _("This vendor bill has been modified from: %s") % (",".join(["<a href=# data-oe-model=purchase.order data-oe-id="+str(order.id)+">"+order.name+"</a>" for order in purchase]))
+                message = _("This vendor bill has been modified from: %s") % (",".join(["<a href=# data-oe-model=purchase.order data-oe-id=" + str(order.id) + ">" + order.name + "</a>" for order in purchase]))
                 invoice.message_post(body=message)
         return result
 
diff --git a/addons/purchase/models/purchase_bill.py b/addons/purchase/models/purchase_bill.py
new file mode 100644
index 00000000000..02b8051c932
--- /dev/null
+++ b/addons/purchase/models/purchase_bill.py
@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, tools
+from odoo.tools import formatLang
+
+class PurchaseBillUnion(models.Model):
+    _name = 'purchase.bill.union'
+    _auto = False
+    _description = 'Bills & Purchases'
+    _order = "purchase_order_id desc, vendor_bill_id desc"
+
+    name = fields.Char(string='Reference', readonly=True)
+    reference = fields.Char(string='Source', readonly=True)
+    partner_id = fields.Many2one('res.partner', string='Vendor', readonly=True)
+    date = fields.Date(string='Date', readonly=True)
+    amount = fields.Float(string='Amount', readonly=True)
+    currency_id = fields.Many2one('res.currency', string='Currency', readonly=True)
+    company_id = fields.Many2one('res.company', 'Company', readonly=True)
+    vendor_bill_id = fields.Many2one('account.invoice', string='Vendor Bill', readonly=True)
+    purchase_order_id = fields.Many2one('purchase.order', string='Purchase Order', readonly=True)
+
+    @api.model_cr
+    def init(self):
+        tools.drop_view_if_exists(self.env.cr, 'purchase_bill_union')
+        self.env.cr.execute("""
+            CREATE OR REPLACE VIEW purchase_bill_union AS (
+                SELECT
+                    id, number as name, reference, partner_id, date, amount_untaxed as amount, currency_id, company_id,
+                    id as vendor_bill_id, NULL as purchase_order_id
+                FROM account_invoice
+                WHERE
+                    type='in_invoice' and state in ('open','paid','cancel')
+            UNION
+                SELECT
+                    -id, name, partner_ref, partner_id, date_order as date, amount_untaxed as amount, currency_id, company_id,
+                    NULL as vendor_bill_id, id as purchase_order_id
+                FROM purchase_order
+                WHERE
+                    state = 'purchase' AND
+                    invoice_status in ('to invoice', 'no')
+            )""")
+
+    def name_get(self):
+        result = []
+        for doc in self:
+            name = doc.name or ''
+            if doc.reference:
+                name += ' - ' + doc.reference
+            amount = doc.amount
+            if doc.purchase_order_id and doc.purchase_order_id.invoice_status == 'no':
+                amount = 0.0
+            name += ': ' + formatLang(self.env, amount, monetary=True, currency_obj=doc.currency_id)
+            result.append((doc.id, name))
+        return result
+
+
+class AccountInvoice(models.Model):
+    _inherit = 'account.invoice'
+
+    vendor_bill_purchase_id = fields.Many2one(
+        comodel_name='purchase.bill.union',
+        string='Auto-Complete'
+    )
+
+    @api.onchange('vendor_bill_purchase_id')
+    def _onchange_bill_purchase_order(self):
+        if not self.vendor_bill_purchase_id:
+            return {}
+        self.purchase_id = self.vendor_bill_purchase_id.purchase_order_id
+        self.vendor_bill_id = self.vendor_bill_purchase_id.vendor_bill_id
+        self.vendor_bill_purchase_id = False
+        return {}
diff --git a/addons/purchase/security/ir.model.access.csv b/addons/purchase/security/ir.model.access.csv
index 1740c592902..3646eeccffe 100644
--- a/addons/purchase/security/ir.model.access.csv
+++ b/addons/purchase/security/ir.model.access.csv
@@ -51,4 +51,5 @@ access_stock_location_purchase_manager,stock.location purchase manager,stock.mod
 access_stock_warehouse_orderpoint_manager,stock.warehouse.orderpoint,stock.model_stock_warehouse_orderpoint,purchase.group_purchase_manager,1,0,0,0
 access_stock_warehouse_orderpoint_user,stock.warehouse.orderpoint,stock.model_stock_warehouse_orderpoint,group_purchase_user,1,0,0,0
 access_product_price_history_purchase_user,prices.history purchase user,product.model_product_price_history,purchase.group_purchase_user,1,0,0,0
-access_product_price_history_purchase_manager,prices.history purchase manager,product.model_product_price_history,purchase.group_purchase_manager,1,1,1,1
\ No newline at end of file
+access_product_price_history_purchase_manager,prices.history purchase manager,product.model_product_price_history,purchase.group_purchase_manager,1,1,1,1
+access_purchase_bill_union,access_purchase_bill_union,model_purchase_bill_union,purchase.group_purchase_user,1,0,0,0
diff --git a/addons/purchase/security/purchase_security.xml b/addons/purchase/security/purchase_security.xml
index 73dcd6c1487..75fbca272f6 100644
--- a/addons/purchase/security/purchase_security.xml
+++ b/addons/purchase/security/purchase_security.xml
@@ -69,5 +69,11 @@
         <field name="domain_force">['|',('order_id.message_partner_ids','child_of',[user.commercial_partner_id.id]),('order_id.partner_id','child_of',[user.commercial_partner_id.id])]</field>
         <field name="groups" eval="[(4, ref('base.group_portal'))]"/>
     </record>
+    <record model="ir.rule" id="purchase_bill_union_comp_rule">
+        <field name="name">Purchases &amp; Bills Union multi-company</field>
+        <field name="model_id" ref="model_purchase_bill_union"/>
+        <field name="global" eval="True"/>
+        <field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
+    </record>
 </data>
 </odoo>
diff --git a/addons/purchase/views/account_invoice_views.xml b/addons/purchase/views/account_invoice_views.xml
index f3eabb91534..794311a7263 100644
--- a/addons/purchase/views/account_invoice_views.xml
+++ b/addons/purchase/views/account_invoice_views.xml
@@ -56,10 +56,18 @@
         <field name="name">account.invoice.supplier.purchase</field>
         <field name="model">account.invoice</field>
         <field name="inherit_id" ref="account.invoice_supplier_form"/>
+        <field name="groups_id" eval="[(4,ref('purchase.group_purchase_user'))]"/>
         <field name="arch" type="xml">
-            <field name="reference" position="after" >
-                 <field name="purchase_id" attrs="{'readonly': [('state','not in',['draft'])], 'invisible': ['|', ('state', '=', 'purchase'), ('type', '=', 'in_refund')]}" class="oe_edit_only"
-                    options="{'no_create': True}" context="{'show_total_amount': True}"/>
+            <field name="vendor_bill_id" position="after">
+                <field name="vendor_bill_purchase_id" attrs="{'invisible': ['|', '|', ('state','not in',['draft']), ('state', '=', 'purchase'), ('type', '=', 'in_refund')]}"
+                    class="oe_edit_only" domain="[('partner_id','child_of',[partner_id])]"
+                    placeholder="Select a purchase order or an old bill"
+                    options="{'no_create': True, 'no_open': True}"/>
+                <field name="purchase_id" class="oe_edit_only"
+                    invisible="1" context="{'show_total_amount': True}"/>
+            </field>
+            <field name="vendor_bill_id" position="attributes">
+                <attribute name="attrs">{'invisible': ['|', ('type', '=', 'in_invoice'), ('state', 'not in', ['draft'])]}</attribute>
             </field>
             <xpath expr="//field[@name='invoice_line_ids']/tree/field[@name='company_id']" position="after">
                 <field name="purchase_line_id" invisible="1" readonly="0"/>
@@ -78,4 +86,37 @@
             </field>
         </field>
     </record>
+
+   <record id="view_purchase_bill_union_filter" model="ir.ui.view">
+        <field name="name">purchase.bill.union.select</field>
+        <field name="model">purchase.bill.union</field>
+        <field name="arch" type="xml">
+            <search string="Search Reference Document">
+                <field name="name" string="Reference" filter_domain="['|', ('name','ilike',self), ('reference','=like',str(self)+'%')]"/>
+                <field name="amount"/>
+                <separator/>
+                <field name="partner_id" operator="child_of"/>
+                <separator/>
+                <filter name="purchase_orders" string="Purchase Orders" domain="[('purchase_order_id', '!=', False)]"/>
+                <filter name="vendor_bills" string="Vendor Bills" domain="[('vendor_bill_id', '!=', False)]"/>
+            </search>
+        </field>
+    </record>
+
+    <record id="view_purchase_bill_union_tree" model="ir.ui.view">
+        <field name="name">purchase.bill.union.tree</field>
+        <field name="model">purchase.bill.union</field>
+        <field name="arch" type="xml">
+            <tree string="Reference Document">
+                <field name="name"/>
+                <field name="reference"/>
+                <field name="partner_id"/>
+                <field name="date"/>
+                <field name="amount"/>
+                <field name="currency_id" invisible="1"/>
+                <field name="company_id" groups="base.group_multi_company" options="{'no_create': True}"/>
+            </tree>
+        </field>
+    </record>
+
 </odoo>