Sum fields amount From Child Table V7

I think what you will have to do is write a ‘for’ loop to do this. I’ll work on this tomorrow, because it’s something I need as well. As for the link, I was just putting it there so that anyone coming across either thread sees the link.

Your value adding functions look correct.

frappe.ui.form.on("Denominaciones", {
    "denominacion": function(frm, cdt, cdn) {
        var d = locals[cdt][cdn];
        frappe.model.set_value(d.doctype, d.name, "valor", d.denominacion * d.cantidad);
    }
});

frappe.ui.form.on("Denominaciones", {
    "cantidad": function(frm, cdt, cdn) {
        var d = locals[cdt][cdn];
        frappe.model.set_value(d.doctype, d.name, "valor", d.denominacion * d.cantidad);
    }
});
frappe.ui.form.on("Denominaciones", {
    "cantidad": function(frm, cdt, cdn) {
        var d = locals[cdt][cdn];
        var total = 0;
        for (i = 0; i < [DONOTYETKNOW]; i++) {
	    total += d.valor;
        }
        frm.set_value('balance_real', total);
    }
});

The part [DONOTYETKNOW] should be how many lines there are in the child table.

I’ll update this post as I look deeper into this.

Different possible solution (From a thread detailing my problem with the same thing, from a while back):