reporting services - ssrs-Pass Report parameter to DrillDown -

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im building report, make group in ssrs (not in dataset), means group created in ssrs,

now, how can pass values of group drill down?

p.s - pseudocode: dataset (build in sql server 2008):

alter.... select      ...concat(x) myx      ,documentid      ,name      ,age  group documentid

in ssrs group myx, myx - has values of 'x' grouped documentid. want pass values of myx drilldown. how can it? thanks

i assume have parameter on drilldown report pass value to. on action sends drilldown set parameter's value expression be:

=fields!myx.value

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