On the tables sales header / purchase header you have a field called 'posting description'. This field is default filled up with document type / document number. This field is also used later during the posting routines and transferred as description to the entries tables (17 / 21 / 25 / ...).

When you work with unposted & posted document numbers on you journal template, then you will have your unposted document number in the description. This works very confusing in the entries tables. Also on reminders this number is printed...

It would be better to have a change in the posting routines, that when the field 'posting description' is still document type + unposted document number, that NAV changes this value during posting to Document Type + definitive document number.