To enable retention-protection for a given object storage group, use ISMF to set the OAM Retention Protection attribute to Enabled in the SMS object storage group definition, and then activate the SCDS. Any objects stored into an object storage group after the OAM Retention Protection attribute has been enabled will be stored as retention-protected objects. Retention-protected objects can be identified as such by the ODSTATF_RETPROT flag in the object directory.
For more information on OAM Retention Protection see Protecting against inadvertent object deletion.