To debug any application containing one or more Assembler modules, with the exception of an application consisting of a standalone Assembler program, you must have an enterprise server available to run the application.
The ES_SERVER_CONSOLE=YES variable must be specified in the enterprise server configuration for the server that will be used to debug Assembler modules.
Non-CICS applications that contain both Assembler and COBOL require that you turn on (check) Allow Dynamic Debugging in the enterprise server configuration.
[ES-Environment] ES_MFASM_SUPPORT=YES ES_SERVER_CONSOLE=YES