目录测试程序中的提交购物车操作会产生以下错误消息：

错误：凭证无效

从 PunchOutOrderMessage (POOM) 中删除具有可选 SupplierID 元素的行。

供应商在 POOM 中包括可选 SupplierID 元素（在 ItemIn 段中）。

在一种情况下，供应商将域设置为 DUNS；但不包含任何值：

<SupplierID domain="DUNS"/>

当包含 SupplierID 元素时，这将覆盖 POOM 中的 From 凭证。

目录测试程序将处理 POOM 并在生成测试 PO 时交换 From/To 凭证上的值。  具体来说，POOM 中的 From 凭证成为 OrderRequest 中的 To 凭证。

因为 SupplierID 覆盖 POOM 中的 From 凭证，所以 OrderRequest (PO) 上的 To 凭证包含一个域/值对，该域/值对取自 SupplierID 中指定的域/值对，其中包含域 DUNS 且值为空。

因此，Ariba Network 采用此错误消息进行响应，因为未在测试 PO 的 From 凭证中指定任何值。

以下是触发此错误的完整 POOM：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE cXML SYSTEM "http://xml.cxml.org/schemas/cXML/1.1.020/cXML.dtd">
<cXML payloadID="DD36DA4C-9F99-457E-BA7A-5B7F5BBEE26912345678"
       timestamp="2011-05-27T15:46:40.377-04" xml:lang="en">
       <Header>
               <From>
                       <Credential domain="NetworkID">
                               <Identity>AN01000001234-T</Identity>
                       </Credential>
               </From>
               <To>
                       <Credential domain="NetworkID">
                               <Identity>AN01000005678-T</Identity>
                       </Credential>
               </To>
               <Sender>
                       <Credential domain="NetworkID">
                               <Identity>AN01000001234-T</Identity>
                       </Credential>
                       <UserAgent>My Punchout Site</UserAgent>
               </Sender>
       </Header>
       <Message>
               <PunchOutOrderMessage>
                       <BuyerCookie>FCzfGGzpEFNZS6pvaBNqKK6tiwvROORM0.3262606413456009532</BuyerCookie>
                       <PunchOutOrderMessageHeader operationAllowed="edit">
                               <Total>
                                   <Money currency="">3.45</Money>
                               </Total>
                       </PunchOutOrderMessageHeader>
                       <ItemIn quantity="1">
                               <ItemID>
                                   <SupplierPartID>2865</SupplierPartID>
                                </ItemID>
                               <ItemDetail>
                                   <UnitPrice>
                                     <Money currency="USD">3.45</Money>
                                   </UnitPrice>
                                   <Description xml:lang="EN">Business Cards - Ordered by: Jane Smith; Quantity: 250 - Sandbox</Description>
                                   <UnitOfMeasure>BX</UnitOfMeasure>
                                   <Classification domain="UNSPSC">14111604</Classification>
                                   <ManufacturerPartID>2865</ManufacturerPartID>
                                   <ManufacturerName>My Excellent Business Card Company</ManufacturerName>
                               </ItemDetail>
                               <SupplierID domain="DUNS"/>
                       </ItemIn>
               </PunchOutOrderMessage>
       </Message>
</cXML>

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