Debugging LangX COBOL when debug information is only available for a few parts

Example: sample LangX COBOL program for debugging

Suppose you want to set a breakpoint at the entry point to COB03AO program and that debug information is available for COB03AO but not for COB03O. In this circumstance, z/OS® Debugger would display an empty Source window. To display a list of compile units known to z/OS Debugger, enter the following commands:

SET ASSEMBLER ON 
LIST NAMES CUS 

The LIST NAMES CUS command displays a list of all the compile units that are known to z/OS Debugger. If COB03AO is fetched later on by the application, it might not be known to z/OS Debugger. Enter the following commands:

LDD COB03AO
AT ENTRY COB03AO
GO