Company code & is being processed by user &

What causes this issue?

Company code &V1& or an asset is blocked by user &V2&. Company code
&V1& cannot be processed at the moment.

System Response

The system does not allow for parallel processing of assets.

How to fix this error?

Wait until user &V2& has finished processing the asset and then carry
out the desired transaction.

Error message extract from SAP system. Copyright SAP SE.