Quickbooks销售收据添加错误

保存销售收据时出错。QuickBooks错误 消息：交易金额必须为正数

当我将此xml提交到quickbooks网络连接器时，它会抛出上述错误。交易金额是多少？它在xml中的位置是什么

<?xml version="1.0" encoding="utf-16"?>
<?qbxml version="12.0"?>
<QBXML>
  <QBXMLMsgsRq onError="stopOnError">
 <SalesReceiptAddRq requestID="1">
  <SalesReceiptAdd>
 <CustomerRef>
   <FullName>Daily Sales Summary</FullName> 
   </CustomerRef>
 <TemplateRef>
 <FullName>Custom Sales Receipt</FullName> 
 </TemplateRef>
 <SalesReceiptLineAdd>
 <ItemRef>
 <FullName>Food</FullName> 
 </ItemRef>
  <Desc>Total Food Sales</Desc> 
  <Amount>50.00</Amount> 
 </SalesReceiptLineAdd>
  </SalesReceiptAdd>
   </SalesReceiptAddRq>
   </QBXMLMsgsRq>
</QBXML>

每日销售总结
海关销售收据
食物
食品销售总额
50

SalesReceiptLineAdd需要的物品

诸如此类：

<SalesReceiptAddRq requestID="2"><SalesReceiptAdd><CustomerRef><FullName>Dang Dinh*</FullName></CustomerRef><TxnDate>2013-11-15</TxnDate><CheckNumber/><PaymentMethodRef><FullName>Check</FullName></PaymentMethodRef><Memo>Test</Memo><IsToBePrinted>False</IsToBePrinted<SalesReceiptLineAdd><ItemRef><FullName>Sales</FullName></ItemRef><Desc>Test</Desc><Quantity>1</Quantity><Rate>1</Rate></SalesReceiptLineAdd></SalesReceiptAdd></SalesReceiptAddRq>

Dang Dinh*2013-11-15CheckTestFalse