The rep parameter must be specified if the default value of the parameter is a duplicate of the rep parameter value of any previously defined loopback point.
Recovery
Enter the rtrv-lbp command and look at the REP field values for the rep parameter.
Re-enter the act/chg/ent-lbp command that generated this error message, specifying a valid combination of parameters. Refer to the command description in Commands User's Guide and to the Maintenance Guide for assistance.