Break point is not working for program calling other program or program running in background. To debug scheduled background program, one can you the keyword "JDBG" on transaction SM37 from selected scheduled program.

steps to debug scheduled program

1. set the break point where you would like to start the debug process (image1)

2. scheduled the program (image2) e.g. from F110

3. choose the scheduled program from transaction SM37 and enter 'JDBG' on command field and click enter(image3)

4. debug process started, click 'F8' to run to the break point you have set

(image1 - set the break point)

(image2 - schedule the background program)

(image3 - SM37 start the debug background program)

(image4 - debug process started)