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OK, I found a resolve for this total calculation functionality in both PDF and HTML forms, I used the following scripts:

var len = expenses.expensesWrapper._expenseRow.count;

var sum = 0.0;

for (var i = 0; i < len; i++){

    sum += xfa.resolveNode("expenses.expensesWrapper.expenseRow[" + i + "].total").rawValue;

}

expenses.total.subTotal.rawValue = sum;