Revenue Plan status change error

Hello

I'm getting the below error when trying to set the revenue plan status to "completed". There are no amendments pending and the billing plan was completed successfully. Any idea about the error?

This is an as-incurred contract and there are no pending revenue events. All accounting lines have been created and journal generated.

Error Message:Because there are still active events on this rev rec plan, it cannot be changed. All of the events must be completed before this rev rec plan can be set to done.

Greatly appreciated.

Gladys