Personnel number 00000000 not permitted

What causes this issue?

You attempted to access personnel number 00000000. The system
interprets 00000000 as a non-existant entry for a personnel number.

System Response

Access is denied.

How to fix this error?

Enter a personnel number.

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.