Looking for pointers in resolving migration issues from Forgerock 6.5.3 to OpenDJ 4.4.x

[srivasud]

We are using Forgerock 6.5.3. We are now looking to migrate from Forgerock 6.5.3 to OpenDJ 4.4.11. We are seeing errors or warnings related to OID differences between them. Looking for help or any pointers if anyone has experience in resolving this.
I am pasting sample exception:
[07/Feb/2022:22:14:05 +0000] category=CORE severity=NOTICE msgID=139 msg=The Directory Server has sent an alert notification generated by class org.opends.server.core.DirectoryServer (alert type org.opends.server.DirectoryServerShutdown, alert ID org.opends.messages.core-141): The Directory Server has started the shutdown process. The shutdown was initiated by an instance of class org.opends.server.core.DirectoryServer and the reason provided for the shutdown was An error occurred while trying to start the Directory Server: ConfigException: There should be no warnings on the schema, but instead got 522 warnings: The definition for the attribute type "ds-cfg-java-class" declared that it should use the syntax "1.3.6.1.4.1.36733.2.1.3.3.15" which is not defined in the schema. The default syntax "1.3.6.1.4.1.36733.2.1.3.3.15" will be used instead; The definition for the attribute type "ds-cfg-enabled" declared that it should use the syntax "1.3.6.1.4.1.36733.2.1.3.3.7" which is not defined in the schema. The default syntax "1.3.6.1.4.1.36733.2.1.3.3.7" will be used instead

Any pointers will help. Appreciate your help on this.