Error
Deferred revenue cannot be booked. Settings for deferred revenue are missing.
(Translation: Uitgestelde omzet kan niet geboekt worden. Er ontbreken instellingen voor uitgestelde omzet.)
Cause
Your Exact Online account is not configured correctly. There is no general ledger account for deferred revenue.
Solution
Go to Exact Online > Administration Settings and click on the 'Financial' tab. Select a general ledger account for deferred revenue