Asset & & & is being processed by user &

What causes this issue?

Asset &V2& &V3& is being blocked by user &V4& in company code &V1&.
Asset &V2& &V3& cannot be processed at the moment.

System Response

The system does not allow parallel processing of assets.

How to fix this error?

Wait until user &V4& has finished processing the asset.

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

Error message extract from SAP system. Copyright SAP SE.