reporting services - Check if a field exists in parameters select value -

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i have dataset brings in distinct values of column 'a' of table 'b' , these form select values parameter 'param_a'. in addition have main dataset brings in data table 'b' , contains column 'a' 'field_a'.i not want alter main dataset , hence using tablix filter filter out result set of main dataset. tablix filter supposed performing below functionality :

expression: fields!field_a.value in (parameter!param_a.value) or fields!field_a.value null

boolean operator : "="

value: true

but unable use operator 'in'. gives me error.could please me out this?

i used 'instr' operator eliminated possibility of using 'in' operator:

iif(instr(join(parameters!project.value,","),fields!project_name.value)>0, true,false)

this helped me!


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