InvoiceDetailTotal Property

[NetForumFieldAttribute("ivd_parity_amount_cp")]
public decimal Total { get; protected set; }

<NetForumFieldAttribute("ivd_parity_amount_cp")>
Public Property Total As Decimal
	Get
	Protected Set

public:
[NetForumFieldAttribute(L"ivd_parity_amount_cp")]
property Decimal Total {
	Decimal get ();
	protected: void set (Decimal value);
}

[<NetForumFieldAttribute("ivd_parity_amount_cp")>]
member Total : decimal with get, set

For InvoiceDetails, a "current" Total can't be calculated without looking up payment information. Even cancellation information isn't enough, because for items that were canceled, the entire payment may not have been returned which effectively acts as a "cancellation fee". As such, the NF-official total of an invoice is actually backwards-dependent on payments information.