Can you tell the procedure on how they can update? Because as far as I know, you need to create text back-up and restore it in new version in order to update. Currently, they cannot make text back-up because of the error.
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...