Asset already assigned to business entity &

What causes this issue?

You have entered an asset number which has already been assigned to
another business entity.

System Response

The system does not accept your entry.

How to fix this error?

Select another asset or create a new Real Estate asset for the business
entity in the assets accounting.

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.