You are not authorized to block/unblock data; see long text

What causes this issue?

You want to block or unblock data relating to business partner &v1&. You
are not authorized to block or unblock this data.

System Response

This transaction cannot be called.

How to fix this error?

If you are sure that you want to block or unblock data relating to
business partner &v1&, perform one of the following actions:
Contact a user in the company who is authorized to display blocked data.
Contact your system administrator and request authorization to block or
unblock data relating to business partners.

Procedure for System Administrators

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.