Maybe you can use some field from the Company Info?
AS far as remember EORI code is for every importer/exporter both for persons and companies. Even if you buy from Aliexpress you use EORI.
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...