Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, AMBFIELD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 field_name is an ambiguous field name

    Facility: DEBUG, VMS Debugger

    Explanation: The reference to the given field cannot be resolved
    because there is more than one field with the given name.

    User Action: Fully qualify the reference with a complete name for
    the desired field.