IItemSubtotalAdd, quickbooks error

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C#

Hello,

I have been making an app for a friend, but recently got stuck. For some reason, when I try to test "itemSubtotalAddRq" I get the following error:

Request[3]: ItemSubtotalAddRq ItemSubtotalAdd
Name: required fiels is missing
End of ItemSubtotalAdd

Im not sure what it is, but I know its one of the ItemSubtotalAddRq lines....

heres the code:

public List<ISalesReceiptLineAdd> salesReceiptAddNew;

public void SalesInfoAdd(IMsgSetRequest requestMsgSet)
{

    ISalesReceiptAdd salesReceiptAddRq = requestMsgSet.AppendSalesReceiptAddRq();
    IItemSubtotalAdd itemSubtotalAddRq = requestMsgSet.AppendItemSubtotalAddRq();
    salesReceiptAddNew = new List<ISalesReceiptLineAdd>();

    salesReceiptAddRq.CustomerRef.FullName.SetValue(Form.phoneNumber.Text);
    salesReceiptAddRq.IsPending.SetValue(true);
    salesReceiptAddRq.IsTaxIncluded.SetValue(false);
    salesReceiptAddRq.FOB.SetValue(Form.orderID.Text);

    salesReceiptAddNew.Clear();
    int cnt = 0;
    //while (i < Form.productID.Count)
    for (int j = 0; j < Form.productID.Count; j++)
    {
        salesReceiptAddNew.Add(salesReceiptAddRq.ORSalesReceiptLineAddList.Append().SalesReceiptLineAdd);

        salesReceiptAddNew[j].ItemRef.FullName.SetValue(Form.productID[j].ToString());
        salesReceiptAddNew[j].ORRatePriceLevel.Rate.SetValue(Convert.ToDouble(Form.pricesList.Items[j]));
        salesReceiptAddNew[j].Quantity.SetValue(Form.QBqt[j]);
        salesReceiptAddNew[j].Desc.SetValue(Form.productsList.Items[j].ToString().ToUpper() + " -" + " " +
                                        Form.QBsku[j].ToString().ToUpper());
        cnt = j;
    }

    if (Form.DiscountType.Text != "None" || Form.DiscountType.Text != " ")
    {
        if (Form.productID.Count >= 2)
        {
            //cnt++;
            //salesReceiptAddNew.Add(salesReceiptAddRq.ORSalesReceiptLineAddList.Append().SalesReceiptLineAdd);
            //salesReceiptAddNew[cnt].ItemRef.FullName.SetValue("SUBTOTAL");
            //salesReceiptAddNew[cnt].ORRatePriceLevel.Rate.SetValue(Form.totalOfAllItems);
            itemSubtotalAddRq.Name.SetValue("SUBTOTAL");
            itemSubtotalAddRq.IsActive.SetValue(true);
            MessageBox.Show("SUBTOTAL added1");
        }
        else
            itemSubtotalAddRq.IsActive.SetValue(false);

        cnt++;
        salesReceiptAddNew.Add(salesReceiptAddRq.ORSalesReceiptLineAddList.Append().SalesReceiptLineAdd);
        salesReceiptAddNew[cnt].ItemRef.FullName.SetValue(Form.DiscountType.Text);
        MessageBox.Show("discount added");
    }

    if(Form.freeShipping.Checked == false)
    {
        cnt++;
        salesReceiptAddNew.Add(salesReceiptAddRq.ORSalesReceiptLineAddList.Append().SalesReceiptLineAdd);
        salesReceiptAddNew[cnt].ItemRef.FullName.SetValue("SHIPPING");
        salesReceiptAddNew[cnt].ORRatePriceLevel.Rate.SetValue(Convert.ToDouble(Form.shipping.Text));
    }

    IMsgSetResponse responseMsgSet = sessionManager.DoRequests(requestMsgSet);

}