Please update your system to released 8.4 2017-11-25 and test there. If you can repeat there, please report a bug, attach crash log (verbosity debug detailed) and forward this crash causing email to local Pm's.
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...
