Read mode is converted to 'Read query when navigating'

What causes this issue?

The query contains selection elements with "Constant Selection". Such a
query cannot be run in the read mode 'Read Everything at Once'.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The read mode is automatically converted.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.