Diagnosis
A zero balance was reported for the combination of assignment key &V1&,cost/revenue type &V2&, and document number &V3&. The processes ofevent-based deferred revenue do not process this combination.
The processes for event-based deferred revenues were not triggered forthe document for the combination mentioned above.

Procedure
The situation described occurs when the revenue and expense itemsbalance to zero in a posting document with this combination ofassignment key and revenue/cost type. If you want to avoid thissituation, then use different revenue and cost types for the revenueitems and expense items.