DefaultRelation documents cannot be created through CMIS, as this document type is marked HiddenInNavigation and CMIS excludes those types from being returned.
org.apache.chemistry.opencmis.commons.exceptions.CmisObjectNotFoundException: 569f57d6-da53-4f97-a0fe-2fff60b4b712 at org.apache.chemistry.opencmis.client.bindings.spi.browser.AbstractBrowserBindingService.convertStatusCode(AbstractBrowserBindingService.java:280) at org.apache.chemistry.opencmis.client.bindings.spi.browser.AbstractBrowserBindingService.post(AbstractBrowserBindingService.java:406) at org.apache.chemistry.opencmis.client.bindings.spi.browser.ObjectServiceImpl.createRelationship(ObjectServiceImpl.java:185) at org.apache.chemistry.opencmis.client.runtime.SessionImpl.createRelationship(SessionImpl.java:1270)