If you specify EXIT(ADEXIT(MYEXIT)), the exit allows the assembler to open the associated data data set. The exit issues a WTO for the first 80 characters of each associated data record.

If you specify EXIT(ADEXIT(MYEXIT(EXIT))), the exit opens the associated data data set. The exit issues a WTO for the first 80 characters of each associated data record passed to the exit.