Hi John,
We saw that a couple of times ... as a result of a COMMIT statement at a wrong place.
Do you have individual changes in codeunit 90?
I would suggest you contact your partner and ask to check the customizations.
If this issue happens/happened in 100% pure unchanged NAV standard functionality then please ask your partner to raise a service ticket with Microsoft .
In any case I would suggest your create a backup at this stage.
Dirk