When to use branches in version tree?

[Игорь Лизунов <i.lizunov@infinnity.ru>]

Hi all!
I have a question. In distrivuted ehr-change process, when I must to use branches?
For example, in common_im at Fig.13 system B creates new branch.
Why not just continue trunk?

-- 
Best regards,

Igor Lizunov
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