Classic Debugger limitations - Explanation requested

Hello Experts,
I'd really appreciate if one can explain me (in its true sense) what is meant by the following statements:
With the classic debugger it is generally not possible to analyze prgrams in debugging mode that run in ABAP processor unit and are called recursively from subordinate unit. For example, a conversion exit cannot be analyzed using this debugger if it runs within a WRITE statement - The debugger in this case is called recursively from within itself.
I am not able to understand what is meant by subordinate unit here and also how can I reproduce this in the system. Meaning what statements should I execute in the system to see it happening before my eyes.
Thanks a lot!
Amiya

>
Amiya Shrivastava wrote:
> Hello Experts,
>
> I'd really appreciate if one can explain me (in its true sense) what is meant by the following statements:
>
> With the classic debugger it is generally not possible to analyze prgrams in debugging mode that run in ABAP processor unit and are called recursively from subordinate unit. For example, a conversion exit cannot be analyzed using this debugger if it runs within a WRITE statement - The debugger in this case is called recursively from within itself.
>
> I am not able to understand what is meant by subordinate unit here and also how can I reproduce this in the system. Meaning what statements should I execute in the system to see it happening before my eyes.
>
> Thanks a lot!
> Amiya
REPORT zytest1.
DATA:
w_matnr TYPE matnr VALUE '1234'.
WRITE : w_matnr.
Place a break point at the WRITE statement, debug the code(F5) in both classic and new debuggers and the see the difference for yourself.
- Rajesh.

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>
Satyamkumar Jha wrote:
> Hi Saravraj ,
>
> Even if 1 session is opened then also it is not going for update debugging.
>
> Thanks
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