Hi.
So we think we fixed the bug.
Can you please check your customers backup import into 8.4 2017.10.03 version latest build and let us know. It is available on standardinstall.com after you log in as test version.
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...