The entered password is not downward compatible (see long text)

What causes this issue?

You have entered a password that either consists of more than 8
characters or contains at least one lowercase letter.
Older systems or middleware components cannot process such passwords.
Therefore, it is possible that you will not be able to log on to older
systems or via an older middleware component with this password.

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?

If you are certain that you are only using password-based logon for
newer systems or newer middleware components, you can ignore this
warning.
Otherwise you should choose a different password, which should consist
of no more than 8 characters and not contain any lowercase letters.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.