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

 value assigned is out of bounds at or near opcode_name

    Facility: DEBUG, VMS Debugger

    Explanation: The value is out of the bounds defined for the data.
    The operation was performed however.

    User Action: Check the results of the operation to make sure they
    are as you expected.