The required SORTBKPT statement defines the breakpoint data set on which the sort control information is stored. At the end of each individual sort or merge, a breakpoint is reached and the information in the breakpoint data set is automatically amended. However, when MAXSORT is program-invoked or when any exit other than an E35 exit is being used, breakpoints cannot be taken. Nevertheless, the SORTBKPT statement must be specified for all MAXSORTs, even those for which a breakpoint/restart is not possible.