User &1 has locked &2 for version &3.

What causes this issue?

DEFINE &USER& = &V1&
INCLUDE MESSAGE_ENQUEUE_USER OBJECT DOKU ID TX
&V2& can be started with an update only once per controlling area,
version, and fiscal year at a particular time. User &V1& has already
started it for version &V3&, fiscal year &V4&.

System Response

&V2& cannot be started because it is locked against processing.

How to fix this error?

Contact user &V1&. You can use transaction SM12 to find out more
information about the lock.

Error message extract from SAP system. Copyright SAP SE.