The UNSORTABLE attribute indicates that the element cannot be selected by the user for sorting.
UNSORTABLE
By default, a TABLE container allows the user to sort the columns by a left-click on the column header.
Use the UNSORTABLE attribute to prevent a sort on a specific column.
Makes sense only for a field that is used for the definition of a column in a TABLE container.
EDIT c01 = item.comment, UNSORTABLE;