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

 operand number operand_number incomplete

    Facility: DEBUG, VMS Debugger

    Explanation: When parsing an instruction, the debugger found an
    incomplete operand.

    User Action: Specify complete operands when entering machine
    instructions.