Set a parameter which is sent to a subreport into 'null'

Hi everyone,
I have a report that has an inner subreport and I want to link one of the parameters to it. The problem is that once the parameter is linked it loses the ability of being null (no 'set to null' check box). Any idea how can this problem be fixed or workaround?
Thanks a lot!

HI Yossi
In linked subreports, the program matches up the records in the subreport with records in the primary report. If you create a primary report with customer information and a subreport with order information and link them, the program creates a subreport for each
customer and includes in that subreport all the orders for that customer.
When you link a subreport to a primary report, the program creates the link by using a parameter field.
When a subreport link field is selected, the program creates:
u2022 A parameter field in the subreport which is then used to retrieve values passed to it by the primary report.
u2022 A record selection formula for the subreport using the parameter field.
u2022 The selection formula limits the subreport to those records in which the link field is equal to the parameter field value.
When the report is run, the program finds the first primary field record it needs and passes the value in the link field to the parameter field in the subreport.The program then creates the subreport with record selection based on the parameter field value.
Hence when you link a main reoport to a subreport you are passing a value from main report to the subreport which then limits the data based on the passed value.
Are you using a stored procedure on the main report and the subreport.
Please give some details on the linking of the main report and the subreport. So that I can try the same at my end.
Thanks
Pradeep Hulke

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<points_begging_removed_by_moderator>
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Copyright (c) 1982, 2009, Oracle. All rights reserved.
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Edited by: P. Forstmann on 19 nov. 2012 08:57

Set a parameter which is sent to a subreport into 'null'

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