Sub report linking

Question

I have a subreport within a main report. The main report has 2 parameters, @startDate and @Enddate. What i want to do restrict the records in the sub-report based on these parameters. I have tried linking the report using these parameters and have also tried to write a formula in the record selection
Eg {fbr_sp_DMining_Assoc_Cnt_SubRep;1.filingdate} > {?Pm-fbr_sp_DMining_Assoc_Cnt;1.@startdate}and {fbr_sp_DMining_Assoc_Cnt_SubRep;1.filingdate} < {?Pm-fbr_sp_DMining_Assoc_Cnt;1.@Enddate}
But it comes up with an error saying it doesn't recognise the fields
Is there another way to do this?

Answer 1

This may look complicated but it works:
1.2.1. Set up the Primary Report
 In the primary report, create 2 parameter fields called startdate and
 enddate.  You do not have to show these fields in the report.
 These parameters are then shown in the report fields list as ?startdate and ?enddate.
 Then create 2 formulas called startdate and enddate.  The startdate formula should only contain the report field value {?startdate} and the enddate formula should only contain the report field value
{?enddate}.
 These Formulas are then shown in the report fields list as @startdate and @enddate.
 These formulas are required because you cannot create a subreport
 link based on a parameter field.
 You must then edit the selection criteria for the main report to include the data range.  Go to the menu options Report|Edit Selection Formula|Record and enter/include the following record selection criteria:
 {table.datefield} >=  {@startdate} and {table.datefield} <= {@enddate}
2.2. Set up the Sub Report
 Create the same 2 parameter fields and the same 2 formula fields in the subreport containing the same values.  These do not have to be on the actual report.  
Now here is the vital part
2.3. Link the Reports
 To link the reports go to the menu options Edit|Subreport Links.
 Select the formula @startdate from the available fields.  This will activate field link section at the bottom of the screen.  Remove the tick from the checkbox to deactivate this area.
 Repeat with the formula @enddate.  Then select OK to close the window.
 Now edit the sub report.  The above procedure will have created two parameter fields in the sub report,
 {?Pm-@startdate} and {?Pm-@enddate}.  These parameters represent the range value passed from the main report.
Finally ---
 You will now have to edit the record selection formula for the sub report.  
 Select Report|Edit Selection Formula|Record from the menu and change the record selection to
 read:
 {table.datefield} >=  {?Pm-@startdate} and {table.datefield} <= {?Pm-@enddate}.