Hello all i try to override unlink method of sale order line. Function called but raise UserError validation not removed. 

Odoo default function:

@api.multi

def unlink(self):

if self.filtered(lambda x: x.state in ('sale', 'done')):

raise UserError(_('You can not remove a sale order line.\nDiscard changes and try setting the quantity to 0.'))

return super(SaleOrderLine, self).unlink()

Custom Override function:

@api.multi

def unlink(self):

if self.filtered(lambda x: x.state in ('sale', 'done')):

pass

return super(test, self).unlink()

Thanks in advance.