Sub Reports - Can't pass more than one parameter

I can pass the parameter created with the click but no others!I want to pass the value of a user input in the parent (this is not selected in the SQL field) to the sub-report. It give the message 'an unkown feature was specified'.Also, should I get this working I really need to pass at least 4 values through but there is only the option of 3, can this be changed?

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Marie_Lindsay_(MLindsay_(Delete)_15608)

I have only gotten subreport parameters to work when they were values named in the SELECT statement; I often have had to include things in the SELECT that I don't really want to display, just so that they are available for the subreport.I believe there is indeed a hard limit of three subreport parameters, unless something has changed with newer versions -- still looks like three when I try it.

Dan_Noble_(bupaadmin_-_(deleted))

Thanks for the reply.I tried adding the parameter to the select statement but, as the parent produces a pie chart, this didn't work. Then I thought of grouping by the input parameter as well and it works!!!Cheers