diff --git a/l10n_it_withholding_tax_payment/models/withholding_tax.py b/l10n_it_withholding_tax_payment/models/withholding_tax.py
index d18751bf3618..2f77cc019fac 100644
--- a/l10n_it_withholding_tax_payment/models/withholding_tax.py
+++ b/l10n_it_withholding_tax_payment/models/withholding_tax.py
@@ -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"/>