Do you mean CC field in the external email you have received? I have got an email on v. 8.3 where CC field did not work in the SERP and the CC adressee haven't received a copy of the email.
More explanation @Paul:
When the issue occurs, should see if restarting presence or lookup helps. If so - that is the issue and should be sorted. First need to ensure that that is the issue...
Hello!
You can mark it as closed as option. If document is connected with other documents you can not delete it so you will not be able to delete PO, as you will not be able to remove Goods receipt...