Be warned, if you are using named groups in AECOSIM and have graphic group lock active and use the wall break tool, every wall in the group will be broken into two!
I think Named Groups are just Graphic Groups that are named.... maybe there should be a pop up warning that some of the elements are 'out of view'.... and a 'pick parade' to select either group number/name ?
Confirmed - a plain old unnamed graphic group also behave this way. The same goes for extending a wall within a GG.