Hello, sorry for my "stupid" question. In a report I put a clause WHERE $X{ IN ,res_partner.id,IDS}[/code]The report is working well. when in preview, in jaspersoft Studio, I need to pass the parameter collection IDS to the report, but I always get this error I tried several ways to pass the list of IDS, but without success: [1,2] 1,2 "1,2" "[1,2]" "{1,2}" and many other... Help!