Hello, 

I have a periodic meeting, let's say to perform a project followup with the project team, and scheduled every wednesday. 
A couple of them has already been done, and status if done for thoses ones.  (screenshot "initial planning")
 

Now this meeting need to be reschedule to occur another day, for whatever reason. 
If i plan it on thursday or friday, all is fine : the already done ones do not change and only the futur meetings are rescheduled (screenshot "shift thursday")
 

But if i plan them earlier in the week, on monday or tuesday, the already done meeting shift as well and they appears to span several days (screenshot "shift monday").
 

Note the already done meetings are in "done" status, timesheets of attendees filled. 

Is there a way to avoid modification of previously done meeting in a periodic one ? 

Thank you for your help.