private function getForcedCustomersIds()
    {
        $mlmIds = array_keys($this->QUALIFIED_CUSTOMERS);
        $where = '';
        foreach ($mlmIds as $one) {
            /* skip first iteration */
            if (strlen($where) > 0) {
                $where .= ' OR ';
            }
            $quoted = $this->conn->quote($one);
            $where .= Customer::A_MLM_ID . "=\"$quoted\"";
        }
        $cols = [Customer::A_CUSTOMER_REF, Customer::A_MLM_ID];
        $result = $this->daoGeneric->getEntities(Customer::ENTITY_NAME, $cols, $where);
        return $result;
    }