private BigDecimal calculateTotalBudgetItems(List<? extends BudgetItem> budgetItems) {

        BigDecimal totalBudgetItem = new BigDecimal(BigInteger.ZERO);

        for(BudgetItem item : budgetItems) {
            totalBudgetItem = (item.getItemMonetaryAmount() != null) ? totalBudgetItem.add(item.getItemMonetaryAmount())
                    : totalBudgetItem.add(BigDecimal.ZERO);
        }

        return totalBudgetItem;
    }