Unit Price not Populating in Great Plains

I'm programmatically creating sales invoices using the Great Plains Web Services.  I'm successfully able to create the sales invoices with line items however ran into a road block where the Unit Price is not being populated in Great Plains.  Post below is the code used to populate the Unit Price for the line items.

SalesInvoiceLine line = new SalesInvoiceLine();

line.IsNonInventory = true;

ItemKey itemKey = new ItemKey();
itemKey.Id = item.Type.ToString();
line.ItemKey = itemKey;

Quantity quantity = new Quantity();
quantity.Value = item.Quantity;
line.Quantity = quantity;
line.UnitPrice = CreateMoneyAmount(item.UnitPrice, currencyKey);

I greatly appreciate the help.

Thank You,

Arthur Tam