IPP .NET DevKit v2 - QBO Item Other Charge % Create

Intuit.Ipp.Data.Qbo.Item otherChargeItem = new Intuit.Ipp.Data.Qbo.Item();
otherChargeItem.Name = "OtherChargePercentageTest";
otherChargeItem.Desc = "Other Charge %";

//Set percentage rate
Money unitPrice = new Money();
unitPrice.Amount = 0.32m;
unitPrice.AmountSpecified = true;
otherChargeItem.UnitPrice = unitPrice;

//Set Income Account
AccountRef incomeAccountRef = new AccountRef();
incomeAccountRef.AccountId = new IdType() {idDomain = idDomainEnum.QBO, Value = "56"};
otherChargeItem.IncomeAccountRef = incomeAccountRef;

//Call Create
Intuit.Ipp.Data.Qbo.Item itemAdded = commonService.Add(otherChargeItem);