I also saw this message today when trying to run the Recompile HAL Files maintenance, when a report was running. It didn't log me out, but I had to wait until the report had finished before it let me recompile.
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...