Translation method & is not permitted.

What causes this issue?

You entered translation method &V1&. This translation method does not
exist in the system.

System Response

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

How to fix this error?

Create this translation method in Asset Customizing, or
enter a different translation method.

Error message extract from SAP system. Copyright SAP SE.