In Sepam series 20 what does it mean “Setting group A and B “in selection of active group in SFT2841 setting tool? When do we use this setting?

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In Sepam series 20 , we have got a "Setting group A and B " option for selection of active group. This option is specifically exist for Sepam series 20 and not others.
In this FAQ we explain why we have it and when we use it.
PLease check the attached file.

AEDL3