Hello Sanjay,
Thank you for your enquiry. Have you tried exporting and importing back the same database? This usually works and in case it doesn't then I would suggest you to try importing latest backup.
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...