if( isnull(local!priorityFilter), null, if( local!priorityFilter = "${report_noValue}", #"SYSTEM_SYSRULES_queryFilter"(field: "${priority_field_name}.value", operator: "is null"), #"SYSTEM_SYSRULES_queryFilter"(field: "${priority_field_name}.value", operator: "=", value: local!priorityFilter) ) )