A watchpoint expression can be a variable (including array elements), field (including array elements), attribute reference (including chained references), or built-in ABL function, such as PROPATH. (For a complete list of valid functions, see Table 3.) However, the expression may not be a CLOB, BLOB, LONGCHAR, RAW, or MEMPTR variable or field. The Debugger checks only that the watchpoint expression follows the conventions for a valid watch.