diff --git a/addons/account/i18n/account.pot b/addons/account/i18n/account.pot
index a5336193698..9357316cf50 100644
--- a/addons/account/i18n/account.pot
+++ b/addons/account/i18n/account.pot
@@ -9467,6 +9467,12 @@ msgstr ""
 msgid "You can not delete a payment that is already posted"
 msgstr ""
 
+#. module: account
+#: code:addons/account/models/account_invoice.py:1360
+#, python-format
+msgid "You can only delete an invoice line if the invoice is in draft state."
+msgstr ""
+
 #. module: account
 #: code:addons/account/models/account_payment.py:128
 #, python-format
diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index e30108c82be..81540697766 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -1354,6 +1354,12 @@ class AccountInvoiceLine(models.Model):
         """
         pass
 
+    @api.multi
+    def unlink(self):
+        if self.filtered(lambda r: r.invoice_id and r.invoice_id.state != 'draft'):
+            raise UserError(_('You can only delete an invoice line if the invoice is in draft state.'))
+        return super(AccountInvoiceLine, self).unlink()
+
 class AccountInvoiceTax(models.Model):
     _name = "account.invoice.tax"
     _description = "Invoice Tax"