Table Relation with multiple filters

I have the following table relation on my Table which allows the user to select and item # from the item table. The list of items that you can select from is filtered to only display items there the "Item Category Code" = 'ROLL STOCK'
I would like to add an 'OR' clause to it so that I can add another Item Category Code = 'Sheet Stock'

field(50084; "Paper Item No."; Code[20]) { 
    TableRelation = Item."No." where ("Item Category Code" = filter ('ROLL STOCK'));