In CICS MAPFAIL is the error condition when a user presses Enter without entering any value in a map field. This is a CICS-specific exception that occurs when the map receives no input data. The other options (ASRA, ASRB, AEI9) are different CICS abend codes - ASRA is a program check, ASRB is a transaction abend, and AEI9 is an invalid EXEC CICS command.