EQA9875E z/OS® Debugger does not support line, batch, or full-screen mode for 64-bit COBOL, PL/I, and C/C++ programs.
Processing will continue as if a QUIT DEBUG command had been entered.

Explanation

The debugger does not support debugging COBOL, PL/I, or C/C++ programs that are compiled for 64-bit (AMODE(64)) in line, batch, or full-screen (3270) mode.

System action

Processing will continue as if a QUIT DEBUG command had been entered.

Programmer response

Specify DBMDT% or TCPIP& in the TEST runtime option to debug 64-bit COBOL, PL/I, and C/C++ programs in remote debug mode.