Hi Ya'll ,

I would be really greatfull if anyone could help me out with this problem.  I'll include as much information as I can.

In our deployed application (wrote in vb.net using vs2005), we have a lot of crystal reports set up.  There are no problems with any other report.  We have never seen this problem before, and I have exhausted every option I can think of to fix it.

Firstly, this is the error message:

This is the function that binds data to the report

    Public Function LoadServiceHistory(ByVal Registration As String) As rptServiceHistory
        Dim oVehicle As New clsVehicle
        oVehicle.Registration = Registration
        'fill job history datatable if at least 1 line of job history found for the booking...
        If oVehicle.ServiceHistoryMostRecentFirst.Count > 0 Then
            ' Get service history for car in this booking
            Dim dtServiceHistory As dsVehicle.VehicleDataSet.VEHICLE_SERVICE_HISTORY_RECORDDataTable = _
                oVehicle.ServiceHistoryMostRecentFirst(False)
            ' Get service details
            Dim dtServiceDetails As New dsVehicle.VehicleDataSet.Vehicle_Service_history_detailsDataTable
            For Each row As dsVehicle.VehicleDataSet.VEHICLE_SERVICE_HISTORY_RECORDRow In dtServiceHistory
                Dim dtTempServiceDetails As dsVehicle.VehicleDataSet.Vehicle_Service_history_detailsDataTable = _
                    oVehicle.ServiceDetails(CType(row.Mileage, Integer), row.Invoice, row.JobNumber)
                For Each detailsRow As dsVehicle.VehicleDataSet.Vehicle_Service_history_detailsRow In dtTempServiceDetails
                    detailsRow.Job_Number = row.JobNumber
                    dtServiceDetails.ImportRow(detailsRow)
                Next
            Next
            Dim tReport As New rptServiceHistory
            tReport.Subreports(0).SetDataSource(CType(dtServiceDetails, DataTable))
            tReport.SetDataSource(CType(dtServiceHistory, DataTable))
            If Trim(Registration) = "" Then
                tReport.SetParameterValue("Registration", "Unregistered Vehicle")
            Else
                tReport.SetParameterValue("Registration", Registration)
            End If
            pLoaded = True
            pReport = tReport
            Return tReport
        Else
            pLoaded = False
            Return New rptServiceHistory
        End If
    End Function

If anyone has a suggestion, I would be very happy to hear it.

Best regards

Thanks for replying...  I've actually managed to solve this by deleting the bindings to my datatables and recreating them.