diff --git a/invoice.py b/invoice.py
index 15755c7cfa..1786417be9 100644
--- a/invoice.py
+++ b/invoice.py
@@ -605,7 +605,7 @@ class Invoice(OSV):
                         if exception:
                             self.raise_user_error(cursor, 'missing_tax_line',
                                     context=context)
-                        tax_obj.unlink(cursor, user, tax.id,
+                        tax_obj.delete(cursor, user, tax.id,
                                 context=context)
                         continue
                     if not currency_obj.is_zero(cursor, user,
@@ -629,7 +629,7 @@ class Invoice(OSV):
         tax_obj = self.pool.get('account.invoice.tax')
         for invoice in self.browse(cursor, user, ids, context=context):
             if invoice.taxes:
-                tax_obj.unlink(cursor, user, [x.id for x in invoice.taxes],
+                tax_obj.delete(cursor, user, [x.id for x in invoice.taxes],
                         context=context)
             computed_taxes = self._compute_taxes(cursor, user, invoice,
                     context=context)
@@ -797,11 +797,11 @@ class Invoice(OSV):
         res = self.name_get(cursor, user, ids, context=context)
         return res
 
-    def unlink(self, cursor, user, ids, context=None):
+    def delete(self, cursor, user, ids, context=None):
         if isinstance(ids, (int, long)):
             ids = [ids]
         self.check_modify(cursor, user, ids, context=context)
-        return super(Invoice, self).unlink(cursor, user, ids,
+        return super(Invoice, self).delete(cursor, user, ids,
                 context=context)
 
     def write(self, cursor, user, ids, vals, context=None):
@@ -1279,11 +1279,11 @@ class InvoiceLine(OSV):
                 self.raise_user_error(cursor, 'modify', context=context)
         return
 
-    def unlink(self, cursor, user, ids, context=None):
+    def delete(self, cursor, user, ids, context=None):
         if isinstance(ids, (int, long)):
             ids = [ids]
         self.check_modify(cursor, user, ids, context=context)
-        return super(InvoiceLine, self).unlink(cursor, user, ids,
+        return super(InvoiceLine, self).delete(cursor, user, ids,
                 context=context)
 
     def write(self, cursor, user, ids, vals, context=None):
@@ -1477,11 +1477,11 @@ class InvoiceTax(OSV):
                         context=context)
         return
 
-    def unlink(self, cursor, user, ids, context=None):
+    def delete(self, cursor, user, ids, context=None):
         if isinstance(ids, (int, long)):
             ids = [ids]
         self.check_modify(cursor, user, ids, context=context)
-        return super(InvoiceTax, self).unlink(cursor, user, ids,
+        return super(InvoiceTax, self).delete(cursor, user, ids,
                 context=context)
 
     def write(self, cursor, user, ids, vals, context=None):
diff --git a/invoice.xml b/invoice.xml
index 0ae609a01c..5700e58d81 100644
--- a/invoice.xml
+++ b/invoice.xml
@@ -83,7 +83,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="False"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
         <record model="ir.model.access" id="access_payment_term_account_admin">
             <field name="model" search="[('model', '=', 'account.invoice.payment_term')]"/>
@@ -91,14 +91,14 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="True"/>
+            <field name="perm_delete" eval="True"/>
         </record>
         <record model="ir.model.access" id="access_payment_term_line">
             <field name="model" search="[('model', '=', 'account.invoice.payment_term.line')]"/>
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="False"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
         <record model="ir.model.access" id="access_payment_term_line_account_admin">
             <field name="model"
@@ -107,7 +107,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="True"/>
+            <field name="perm_delete" eval="True"/>
         </record>
 
         <menuitem parent="menu_invoices_configuration" action="act_payment_term_form"
@@ -145,7 +145,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="False"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
 
         <record model="ir.action.wizard" id="wizard_pay_invoice">
@@ -397,7 +397,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
         <record model="ir.model.access" id="access_invoice_account">
             <field name="model" search="[('model', '=', 'account.invoice')]"/>
@@ -405,7 +405,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="True"/>
+            <field name="perm_delete" eval="True"/>
         </record>
         <record model="ir.action.report" id="report_invoice">
             <field name="name">Invoice</field>
@@ -555,7 +555,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
         <record model="ir.model.access" id="access_invoice_line_account">
             <field name="model" search="[('model', '=', 'account.invoice.line')]"/>
@@ -563,7 +563,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="True"/>
+            <field name="perm_delete" eval="True"/>
         </record>
 
         <record model="ir.ui.view" id="invoice_tax_view_form">
@@ -621,7 +621,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="False"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
         <record model="ir.model.access" id="access_invoice_tax_account">
             <field name="model" search="[('model', '=', 'account.invoice.tax')]"/>
@@ -629,7 +629,7 @@
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
             <field name="perm_create" eval="True"/>
-            <field name="perm_unlink" eval="True"/>
+            <field name="perm_delete" eval="True"/>
         </record>