diff --git a/l10n_it_withholding_tax_payment/README.rst b/l10n_it_withholding_tax_payment/README.rst
index 5363bcf89caf..ddfdc7526464 100644
--- a/l10n_it_withholding_tax_payment/README.rst
+++ b/l10n_it_withholding_tax_payment/README.rst
@@ -30,11 +30,7 @@ Bug Tracker
 Bugs are tracked on `GitHub Issues
 <https://github.com/OCA/l10n-italy/issues>`_. In case of trouble, please
 check there if your issue has already been reported. If you spotted it first,
-help us smashing it by providing a detailed and welcomed `feedback
-<https://github.com/OCA/
-l10n-italy/issues/new?body=module:%20
-l10n_it_withholding_tax%0Aversion:%20
-8.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+help us smash it by providing detailed and welcomed feedback.
 
 Credits
 =======
diff --git a/l10n_it_withholding_tax_payment/__init__.py b/l10n_it_withholding_tax_payment/__init__.py
index eea7f1a56c73..93a9bd4dd9b4 100644
--- a/l10n_it_withholding_tax_payment/__init__.py
+++ b/l10n_it_withholding_tax_payment/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from . import models, wizard
diff --git a/l10n_it_withholding_tax_payment/__manifest__.py b/l10n_it_withholding_tax_payment/__manifest__.py
index ec696ed133d7..c53dfb1252d4 100644
--- a/l10n_it_withholding_tax_payment/__manifest__.py
+++ b/l10n_it_withholding_tax_payment/__manifest__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 {
diff --git a/l10n_it_withholding_tax_payment/data/sequence.xml b/l10n_it_withholding_tax_payment/data/sequence.xml
index d24fed743a4a..575e77e62c87 100644
--- a/l10n_it_withholding_tax_payment/data/sequence.xml
+++ b/l10n_it_withholding_tax_payment/data/sequence.xml
@@ -1,14 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<odoo>
-    <data noupdate="1">
+<odoo noupdate="1">
 
-        <record id="seq_wt_move_payment" model="ir.sequence">
-            <field name="name">Withholding Tax Move Payment Number</field>
-            <field name="code">withholding.tax.move.payment</field>
-            <field eval="4" name="padding"/>
-            <field name="prefix">WTMP/</field>
-            <field name="company_id" eval="False"/>
-        </record>
-
-    </data>
-</odoo>
\ No newline at end of file
+    <record id="seq_wt_move_payment" model="ir.sequence">
+        <field name="name">Withholding Tax Move Payment Number</field>
+        <field name="code">withholding.tax.move.payment</field>
+        <field eval="4" name="padding"/>
+        <field name="prefix">WTMP/</field>
+        <field name="company_id" eval="False"/>
+    </record>
+    
+</odoo>
diff --git a/l10n_it_withholding_tax_payment/models/__init__.py b/l10n_it_withholding_tax_payment/models/__init__.py
index f1eb1a813a88..bab6fc4aaa04 100644
--- a/l10n_it_withholding_tax_payment/models/__init__.py
+++ b/l10n_it_withholding_tax_payment/models/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 
diff --git a/l10n_it_withholding_tax_payment/models/withholding_tax.py b/l10n_it_withholding_tax_payment/models/withholding_tax.py
index 6ce7186d1e43..2f77cc019fac 100644
--- a/l10n_it_withholding_tax_payment/models/withholding_tax.py
+++ b/l10n_it_withholding_tax_payment/models/withholding_tax.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 
@@ -157,3 +157,10 @@ def move_payment_confirmed(self):
                 # Wt move set to due
                 for wt_move in move.line_ids:
                     wt_move.action_paid()
+
+    @api.multi
+    def unlink(self):
+        for payment in self:
+            if payment.state != 'draft':
+                raise ValidationError(_("You can only delete draft payments"))
+        return super(WithholdingTaxMovePayment, self).unlink()
diff --git a/l10n_it_withholding_tax_payment/views/withholding_tax.xml b/l10n_it_withholding_tax_payment/views/withholding_tax.xml
index 8d3b3271038a..3d37a6ff73fa 100644
--- a/l10n_it_withholding_tax_payment/views/withholding_tax.xml
+++ b/l10n_it_withholding_tax_payment/views/withholding_tax.xml
@@ -75,7 +75,7 @@
                         <newline/>
                         <group>
                             <field name="line_ids" nolabel="1">
-                                <tree>
+                                <tree delete="false">
                                     <field name="date"/>
                                     <field name="partner_id"/>
                                     <field name="withholding_tax_id"/>
diff --git a/l10n_it_withholding_tax_payment/wizard/__init__.py b/l10n_it_withholding_tax_payment/wizard/__init__.py
index 742aa3ce5989..2c842296c4e5 100644
--- a/l10n_it_withholding_tax_payment/wizard/__init__.py
+++ b/l10n_it_withholding_tax_payment/wizard/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 
diff --git a/l10n_it_withholding_tax_payment/wizard/create_move_payment.py b/l10n_it_withholding_tax_payment/wizard/create_move_payment.py
index 92574bfb4921..b15a2b230b6a 100644
--- a/l10n_it_withholding_tax_payment/wizard/create_move_payment.py
+++ b/l10n_it_withholding_tax_payment/wizard/create_move_payment.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright © 2015 Alessandro Camilli (<http://www.openforce.it>)
+# Copyright 2015 Alessandro Camilli (<http://www.openforce.it>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 
diff --git a/l10n_it_withholding_tax_payment/workflow.xml b/l10n_it_withholding_tax_payment/workflow.xml
index bb3a78dc51e0..dd4bad1b2e1e 100644
--- a/l10n_it_withholding_tax_payment/workflow.xml
+++ b/l10n_it_withholding_tax_payment/workflow.xml
@@ -1,48 +1,46 @@
 <?xml version="1.0" encoding="utf-8"?>
-<openerp>
-    <data>
-        <!-- WT move -->
-        <!-- Workflow definition -->
+<odoo>
+    <!-- WT move -->
+    <!-- Workflow definition -->
 
-        <record id="wkf_wt_move_payment" model="workflow">
-            <field name="name">withholding.tax.move.payment.wkf</field>
-            <field name="osv">withholding.tax.move.payment</field>
-            <field name="on_create">True</field>
-        </record>
+    <record id="wkf_wt_move_payment" model="workflow">
+        <field name="name">withholding.tax.move.payment.wkf</field>
+        <field name="osv">withholding.tax.move.payment</field>
+        <field name="on_create">True</field>
+    </record>
 
-        <record id="act_draft" model="workflow.activity">
-            <field name="wkf_id" ref="wkf_wt_move_payment"/>
-            <field name="name">draft</field>
-            <field name="kind">function</field>
-            <field name="action">
-            move_payment_to_draft()
-            </field>
-            <field name="flow_start">True</field>
-        </record>
+    <record id="act_draft" model="workflow.activity">
+        <field name="wkf_id" ref="wkf_wt_move_payment"/>
+        <field name="name">draft</field>
+        <field name="kind">function</field>
+        <field name="action">
+        move_payment_to_draft()
+        </field>
+        <field name="flow_start">True</field>
+    </record>
 
-        <record id="act_confirmed" model="workflow.activity">
-            <field name="wkf_id" ref="wkf_wt_move_payment"/>
-            <field name="name">confirmed</field>
-            <field name="kind">function</field>
-            <field name="action">
-            move_payment_confirmed()
-            </field>
-        </record>
+    <record id="act_confirmed" model="workflow.activity">
+        <field name="wkf_id" ref="wkf_wt_move_payment"/>
+        <field name="name">confirmed</field>
+        <field name="kind">function</field>
+        <field name="action">
+        move_payment_confirmed()
+        </field>
+    </record>
 
 
-        <!-- transitions -->
-        <record id="rec_move_payment_t1" model="workflow.transition">
-            <field name="act_from" ref="act_draft"/>
-            <field name="act_to" ref="act_confirmed"/>
-            <field name="signal">confirmed</field>
-            <field name="group_id" ref="base.group_user"/>
-        </record>
+    <!-- transitions -->
+    <record id="rec_move_payment_t1" model="workflow.transition">
+        <field name="act_from" ref="act_draft"/>
+        <field name="act_to" ref="act_confirmed"/>
+        <field name="signal">confirmed</field>
+        <field name="group_id" ref="base.group_user"/>
+    </record>
 
-        <record id="rec_move_payment_t3" model="workflow.transition">
-            <field name="act_from" ref="act_confirmed"/>
-            <field name="act_to" ref="act_draft"/>
-            <field name="signal">cancel</field>
-        </record>
-     </data>
+    <record id="rec_move_payment_t3" model="workflow.transition">
+        <field name="act_from" ref="act_confirmed"/>
+        <field name="act_to" ref="act_draft"/>
+        <field name="signal">cancel</field>
+    </record>
 
-</openerp>
+</odoo>