Hi @11177 ,
your syntax is incorrect here, as you’re passing both the filtered table and the whole column as an argument. Use either
Task.Filter(ProjectTask.Contains(thisTable.Filter(RecordType="Week" ).List1.ListCombine() ) ).Tasks
or
Task.Filter(ProjectTask.Contains(ListCombine(thisTable.Filter(RecordType="Week" ).List1) ) ).Tasks