Assignement closed on Periodic Meeting

Hello,

since we upgrade to the version 11.3.2, all the assignements of the Periodic Meetings became closed, and even if we create a new one it is always closed and it is impossible to open it.
 

On each unitary meeting of those, the assignements are opened, but when we fill our timesheet sometimes (and it seems really random) we cannont save it, because we get this error :


Can you help me figure out why and how to fix it, please?

Regards,
MCanuto
 

Hello,

I realised that when we can save our time over the meeting, that information disappears (on the timesheet)
 

is not present on any planning or real work report, but on the meeting I have a real time