Rule-based certificate mapping has been deactivated

What causes this issue?

You can activate and deactivate rule-based certificate mapping using the
system parameter "login/certificate_mapping_rulebased".

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.