$installment_clause .= " AND $frequency_unit_db_alias = 'week' ) OR \n";
$installment_clause .= '(' .
$this->dateClause("DATE_ADD($start_date_db_alias, INTERVAL $installments_db_alias * COALESCE($frequency_interval_db_alias, 1) year)",
$installment_clause .= " AND $frequency_unit_db_alias = 'week' ) OR \n";
$installment_clause .= '(' .
$this->dateClause("DATE_ADD($start_date_db_alias, INTERVAL $installments_db_alias * COALESCE($frequency_interval_db_alias, 1) year)",