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添加文档时出现此错误"基本文档卡和目标文档卡不匹配"

 SAPbobsCOM.Documents oPDPMRequest =（SAPbobsCOM.Documents）fmCo.GetBusinessObject（SAPbobsCOM.BoObjectTypes.oPurchaseDownPayments）;
 如果（oPDPMRequest.GetByKey（int.Parse（FldVal）））

   SAPbobsCOM.Documents oPDPMInvoice =（SAPbobsCOM.Documents）fmCo.GetBusinessObject（SAPbobsCOM.BoObjectTypes.oPurchaseDownPayments）;
                    
  //设置预付款标题值
   oPDPMInvoice.CardCode = oPDPMRequest.CardCode;
   oPDPMInvoice.DocDueDate = DateTime.Now;
   oPDPMInvoice.DownPaymentPercentage = oPDPMRequest.DownPaymentPercentage;
   oPDPMInvoice.VatPercent = oPDPMRequest.VatPercent;
   oPDPMInvoice.DiscountPercent = 0;
   oPDPMInvoice.DocTotal = oPDPMRequest.DocTotal;
   oPDPMInvoice.DocRate = oPDPMRequest.DocRate;
   oPDPMInvoice.GroupNumber = oPDPMRequest.GroupNumber;
   oPDPMInvoice.DeferredTax = oPDPMInvoice.DeferredTax;

 //设置预付款类型
  oPDPMInvoice.DownPaymentType = SAPbobsCOM.DownPaymentTypeEnum.dptInvoice;

 //设置预付款行值
   oPDPMInvoice.Lines.BaseType = 22;
   oPDPMInvoice.Lines.BaseEntry = oPDPMRequest.DocEntry;

    如果（oPDPMInvoice.Add（）！= 0）
     {
          Application.SBO_Application.MessageBox（fmCo.GetLastErrorDescription（））;
          返回;
       }
     其他
       {
         Application.SBO_Application.MessageBox（"购买发票[" + fmCo.GetNewObjectKey（）+"]已创建！"）；
       }
     }