i m having trouble with the Groups.

I ve created a group incliding walls, doors and windows.

However the last couple of days as im creating a new door in that group there is a warning coming up saying:

 

 

'can't keep elements joined'

 

and

 

'Group members had to be "moved to the project" (removed from their group instance) because they were not consistent with the group type definition.'

 

Does anyone have any idea about the warnings??

 

thanks,

E