AEC1
Explanation
An attempt has been made to use the Command Level Interpreter (CECI) or the Enhanced Master Terminal (CEMT) or an RDO (CEDA, CEDB, CEDC) transaction on a terminal that is not supported.
System action
The task is abnormally terminated with a CICS transaction dump.
User response
Use a terminal that is supported by the Command Level Interpreter, Enhanced Master Terminal, or RDO transaction.