Multiple entries of application &1 selected as standard (&2, &3)

What causes this issue?

Both server &V2& (for which the current message is being displayed) and
server &V3& are selected as proposals for application &V1&.

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?

Ensure that only one server is selected as a proposal for application
&V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.