I can write answers to the question by using back-end. It's very useful. 

I saw there the button "Save & Next" and I thought I can tap it, save one answer and go to the editing the second answer to the same question**. But got an error.

(** For example, in task to change "author" filed, when I transfer a bunch of Q&A from my forum (I decided to shut it down) to CommAnswer component.)

See the pictture with error^