Proxies with attached schemas must play well with dublincore listener

Caused by: org.nuxeo.ecm.core.api.ClientException: failed to write document part
	at org.nuxeo.ecm.core.api.DocumentModelFactory.writeDocumentModel(DocumentModelFactory.java:305)
	at org.nuxeo.ecm.core.api.AbstractSession.writeModel(AbstractSession.java:558)
	at org.nuxeo.ecm.core.api.AbstractSession.saveDocument(AbstractSession.java:1981)
Caused by: org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentVersion$VersionNotModifiableException: Cannot set property on a version: dc:modified = java.util.GregorianCalendar[...]
	at org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentVersion.setPropertyValue(SQLDocumentVersion.java:254)
	at org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentLive.writeDocumentPart(SQLDocumentLive.java:178)
	at org.nuxeo.ecm.core.storage.sql.coremodel.SQLDocumentProxy.writeDocumentPart(SQLDocumentProxy.java:193)
	at org.nuxeo.ecm.core.api.DocumentModelFactory.writeDocumentModel(DocumentModelFactory.java:299)
	... 151 more