diff --git a/account_usability/__manifest__.py b/account_usability/__manifest__.py
index 219523f..8413f22 100644
--- a/account_usability/__manifest__.py
+++ b/account_usability/__manifest__.py
@@ -30,6 +30,9 @@ This module has been written by Alexis de Lattre from Akretion <alexis.delattre@
     'author': 'Akretion',
     'website': 'http://www.akretion.com',
     'depends': ['account'],
-    'data': ['account_view.xml'],
+    'data': [
+        'account_view.xml',
+        'partner_view.xml',
+        ],
     'installable': True,
 }
diff --git a/account_usability/account.py b/account_usability/account.py
index 88a7951..82501a0 100644
--- a/account_usability/account.py
+++ b/account_usability/account.py
@@ -33,6 +33,12 @@ class AccountInvoice(models.Model):
     # for invoice report
     has_discount = fields.Boolean(
         compute='_compute_has_discount', readonly=True)
+    # has_attachment is useful for those who use attachment to archive
+    # supplier invoices. It allows them to find supplier invoices
+    # that don't have any attachment
+    has_attachment = fields.Boolean(
+        compute='_compute_has_attachment',
+        search='_search_has_attachment', readonly=True)
 
     @api.multi
     def _compute_has_discount(self):
@@ -45,6 +51,30 @@ class AccountInvoice(models.Model):
                     break
             inv.has_discount = has_discount
 
+    def _compute_has_attachment(self):
+        iao = self.env['ir.attachment']
+        for inv in self:
+            if iao.search([
+                    ('res_model', '=', 'account.invoice'),
+                    ('res_id', '=', inv.id),
+                    ('type', '=', 'binary'),
+                    ('company_id', '=', inv.company_id.id)], limit=1):
+                inv.has_attachment = True
+            else:
+                inv.has_attachment = False
+
+    def _search_has_attachment(self, operator, value):
+        att_inv_ids = {}
+        if operator == '=':
+            search_res = self.env['ir.attachment'].search_read([
+                ('res_model', '=', 'account.invoice'),
+                ('type', '=', 'binary'),
+                ('res_id', '!=', False)], ['res_id'])
+            for att in search_res:
+                att_inv_ids[att['res_id']] = True
+        res = [('id', value and 'in' or 'not in', att_inv_ids.keys())]
+        return res
+
     # I really hate to see a "/" in the 'name' field of the account.move.line
     # generated from customer invoices linked to the partners' account because:
     # 1) the label of an account move line is an important field, we can't
@@ -63,6 +93,12 @@ class AccountInvoice(models.Model):
             self.invalidate_cache()
         return res
 
+    def delete_lines_qty_zero(self):
+        lines = self.env['account.invoice.line'].search([
+            ('invoice_id', 'in', self.ids), ('quantity', '=', 0)])
+        lines.unlink()
+        return True
+
 
 class AccountInvoiceLine(models.Model):
     _inherit = 'account.invoice.line'
diff --git a/account_usability/account_view.xml b/account_usability/account_view.xml
index f1afd10..b70cf92 100644
--- a/account_usability/account_view.xml
+++ b/account_usability/account_view.xml
@@ -16,6 +16,9 @@
         <field name="fiscal_position_id" position="attributes">
             <attribute name="widget">selection</attribute>
         </field>
+        <field name="invoice_line_ids" position="before">
+            <button name="delete_lines_qty_zero" states="draft" string="⇒ Delete lines qty=0" type="object" class="oe_link oe_right" groups="account.group_account_invoice"/>
+        </field>
     </field>
 </record>
 
@@ -41,6 +44,21 @@
     </field>
 </record>
 
+<record id="view_account_invoice_filter" model="ir.ui.view">
+    <field name="name">account_usability.invoice.search</field>
+    <field name="model">account.invoice</field>
+    <field name="inherit_id" ref="account.view_account_invoice_filter"/>
+    <field name="arch" type="xml">
+        <filter name="late" position="after">
+            <separator/>
+             <filter name="to_send" string="To Send" domain="[('sent', '=', False), ('state', 'in', ('open', 'paid'))]"/>
+             <filter name="sent" string="Sent" domain="[('sent', '=', True)]"/>
+            <separator/>
+            <filter name="no_attachment" string="Missing Attachment" domain="[('has_attachment', '=', False)]"/>
+         </filter>
+    </field>
+</record>
+
 <!-- Having a menu entry on invoice lines is often very usefull for odoo user:
 they can search in their lines, etc...
 So I enhance the generic views and add actions, but I don't add menu entries here ;
diff --git a/account_usability/partner_view.xml b/account_usability/partner_view.xml
new file mode 100644
index 0000000..13e2f27
--- /dev/null
+++ b/account_usability/partner_view.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  © 2017 Akretion (http://www.akretion.com/)
+  @author: Alexis de Lattre <alexis.delattre@akretion.com>
+  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+-->
+
+<odoo>
+
+
+<record id="view_partner_property_form" model="ir.ui.view">
+    <field name="name">account_usability.res.partner.form</field>
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="account.view_partner_property_form"/>
+    <field name="arch" type="xml">
+        <field name="property_account_position_id" position="attributes">
+            <attribute name="widget">selection</attribute>
+        </field>
+    </field>
+</record>
+
+
+</odoo>