Hello, While working on a dataentry form (enter data, refresh, save draft, etc), our users have frequently the following error (in add-in log): "cannot render matrix xxx. server returned: current session is no more valid due to structural change in database" (translation from french). The user has to close and reopen the assignment to continue. No changes were made in the BusinessModeler during that time. (PPS Planning SP2). Questions: what does this error mean ? why does it happened ? how to prevent this ? Thanks for your help
