SYST: Asset class blocking not possible (Contact System Specialist)

What causes this issue?

The system has tried to block asset class &V1&. A system error has
occurred while blocking.

System Response

The system terminates processing of the asset class.

How to fix this error?

Contact your Systems Specialist.

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.