i'm trying to cancel the advance payment which is created against the payment which is conformed 

inherited the account.payment and override the action_draft payment method, i have passed the current payment reference into advance payment while creating advance payment

here is my code for canceling the advance payment

def action_draft(self):
    moves = self.mapped('move_line_ids.move_id')
    moves.filtered(lambda move: move.state == 'posted').button_draft()
    moves.with_context(force_delete=True).unlink()
    self.write({'state': 'draft', 'invoice_ids': False})
    advance_payment = self.search([('base_payment_id', '=', self.id),
                                           ('payment_category', '=', 'advance_payment'), ('state', '=', 'posted')])
    if advance_payment:
          advance_payment.action_draft()
          advance_payment.cancel()

this code work fine and cancel the advance payment but its give warning

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