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我在执行代码时执行此代码以打印Ap发票而无法正常工作

 SAPbobsCOM.ReportLayoutsService oReportLayoutService =（SAPbobsCOM.ReportLayoutsService）var_public.Vcmp.GetCompanyService（）。GetBusinessService（SAPbobsCOM.ServiceTypes.ReportLayoutsService）;
             SAPbobsCOM.ReportLayoutPrintParams oReporPrintParams = oReportLayoutService.GetDataInterface（SAPbobsCOM.ReportLayoutsServiceDataInterfaces.rlsdiReportLayoutPrintParams）;
             SAPbobsCOM.ReportParams oReportParam = oReportLayoutService.GetDataInterface（SAPbobsCOM.ReportLayoutsServiceDataInterfaces.rlsdiReportParams）;
             oReportParam.ReportCode =" PCH2";
             SAPbobsCOM.DefaultReportParams oReportParaDefault = oReportLayoutService.GetDefaultReport（oReportParam）;
             oReporPrintParams.LayoutCode =" PCH20002";
             oReporPrintParams.DocEntry = Convert.ToInt32（38259）;
             oReportLayoutService.Print（oReporPrintParams）;