TO INVESTIGATE DATA REPORT ERRORS:

ERROR: "Report item expressions can only refer to fields within the current data set scope or, if inside an aggregate, the specified data set scope."

1.  Select Report -->  Data Sources and assure that proper sources are selected and that they match:

2.  Right-Click on Table --> Properties --> DataSet Name

3.  Assure that if multiple data tables are used, that field is suffixed with proper data set, especially if field name is in dataset more than once:  =((Fields!PART_MH.Value), "ds_datasetname_datatablename")

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Re: Is there any way to find the error in SubReport?

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When you run the app, Visual Studio Output window (from the menu choose View > Output) shows these warning messages:

Case 1: Report definition (.rdlc) cannot be found:

Warning: An error occurred while executing the subreport 'subreport1': The report definition for report 'Books' has not been specified (rsErrorExecutingSubreport)

Case 2: Parameter not passed by main report:

Warning: An error occurred while executing the subreport 'subreport1': One or more parameters required to run the report have not been specified. (rsErrorExecutingSubreport)

Case 3: Data for subreport not supplied:

Warning: An error occurred while executing the subreport 'subreport1': An error has occurred during report processing. (rsErrorExecutingSubreport)