Error after OpenLDAP update from 2.4 to 2.5 - ppolicy schema

Hello, unfortunately I missed the update version note for the schema ppolicy. After updating and restarting the slapd service, I can no longer delete the schema. I get the following error message:

"root@dsme01:~# slapcat -n0 > config.ldif olcAttributeTypes: value #0 olcAttributeTypes: Duplicate attributeType: "1.3.6.1.4.1.42.2.27.8.1.1" config error processing cn={15}ppolicy,cn=schema,cn=config: olcAttributeTypes: Duplicate attributeType: "1.3.6.1.4.1.42.2.27.8.1.1" slapcat: bad configuration file!"

What can I do now? Greetings from Stefan Harbich