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

 index and base registers are equal for operand number operand_number

    Facility: DEBUG, VMS Debugger

    Explanation: When parsing an instruction, the debugger found an
    operand whose base register and index registers were the same.
    The VAX instruction architecture forbids this construction.

    User Action: Specify different registers for the base and index
    registers.