EQA9978I Unable to set hook because debug data cannot be located for program_name

Explanation
z/OS® Debugger is unable to set a hook and stop in
this program because the separate debug file cannot
be located. This program was specified using a DTCN profile.

Programmer response
Verify that the debug data file exists and make its location known to z/OS Debugger by using the SET DEFAULT
LISTINGS or SET SOURCE command, the EQAUEDAT user exit or the EQADEBUG DD
name.