Hi Iosu Buenetxea,
You cannot add parameters on the report book itself and then somehow match the report book's parameters to the parameters of the reports contained in the book. All parameters that a report book can have are those from the underlying reports. The reports instances within the ReportBook constructor are not processed and you can only access the report's definition. Thus you cannot use the ReportBook's constructor to add report's based on the report parameters.
I can suggest another approach and it is to use subreports. The idea is to have a master report with detail section and subreport item in it. Then based on parameters coming from the SL client the master report will generate data source feeding the report with subreports.
Check out the attached sample reports demonstrating the idea.
NOTE: Mind the slightly different rendering of subreports against report book (in the pointed article). For example page sections of subreport are ignored (page sections of the master report are rendered).
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