CO document &1 / &2 is currently locked by user &3

What causes this issue?

CO document &V1& (controlling area &V2&) is currently being transferred
to Financial Accounting by user &V3&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

DEFINE &USER& = &V3&
INCLUDE MESSAGE_ENQUEUE_USER OBJECT DOKU ID TX

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.