Can't use "is contained in the list" for Integer field

1)Create Data Object asset with Integer field 2)Create Guided Rule Templates asset 3)In WHEN add created Data Object 4)Modify constraints for added Data Object and choose Integer field 5)Choose option "is contained in the (comma separated) list" for created field 6)Click on "Edit" and choose "Template key" 7)Navigate to "Data" and try to put more than on number separated by comma. It's possible to add only one number without whitespaces