Did you have any HAL customisations that would have affected this behaviour? I haven't heard of this problem before but I can look into it if you are able to provide me with backup that this might be repeatable in.
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...