Document link: https://docs.redhat.com/en/documentation/red_hat_directory_server/13/html/configuration_and_schema_reference/core-server-configuration-attributes#passwordinhistory

Section number and name: 2.1.215 passwordInHistory

Attribute description states passwordInHistory can only have values 1 to 24, but it reality it can also be set to 0 (no password history is kept, but prevents repeated use of current password)