3042159 - Balances still exist error happens when changing the status of the customer project into "Closed"

In Plan Customer Projects App, when setting status to "Closed" and save, error "Balances still exist for event-based revenue recognition for WBS xxxx" occurs.

SAP S/4HANA Cloud

In Plan Customer Projects App, set status to "Closed" and save.

One of the possible reason:
 You have done manual adjustments on one of the items for the project. Although the balance on project level is OK, the error may still occur.
 It's necessary to ensure that the balance is OK on each billing element of the project.

Please first solve the manual adjustments and rerun the period-end closing activity to get the balance to 0.

event-based, revenue recognition, balance, customer project, status, closed, error. , KBA , CO-PC-OBJ-EBR , Event-Based Revenue Recognition , Problem