RS trying to delete a used media in media center

2016-09-28 20:36:50,178 [ajp-nio2-8004-exec-124] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N4-E72 

https://e.xyz.ch/auth/HomeSite/280035347/PortfolioV2/0/MediaCenter/0/Media/417 

Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2632.0 Safari/537.36

**RedScreen** org.hibernate.exception.ConstraintViolationException: could not execute statement

<dispatchinfo>
	<componentinfo>
		<compname>link_0</compname>
		<compclass>org.olat.core.gui.components.link.Link</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>link_0</command>
			<tostring>com:link_0,org.olat.core.gui.control.Event@be46a54a</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.gui.control.generic.modal.DialogBoxController</controllername>
		<controllername>org.olat.modules.portfolio.ui.MediaDetailsController</controllername>
		<controllername>org.olat.modules.portfolio.ui.MediaCenterController</controllername>
		<controllername>org.olat.modules.portfolio.ui.PortfolioHomeController</controllername>
		<controllername>org.olat.modules.portfolio.ui.PortfolioPersonalToolController</controllername>
		<controllername>org.olat.home.HomeMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: org.hibernate.exception.ConstraintViolationException: could not execute statement
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:547)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:240)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:275)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:192)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:292)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:235)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
-> at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
   at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
   at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1383)
   at org.hibernate.Query.getResultList(Query.java:417)
   at org.olat.modules.portfolio.manager.MediaDAO.searchByAuthor(MediaDAO.java:142)
   at org.olat.modules.portfolio.manager.PortfolioServiceImpl.searchOwnedMedias(PortfolioServiceImpl.java:946)
   at org.olat.modules.portfolio.ui.MediaCenterController.loadModel(MediaCenterController.java:260)
   at org.olat.modules.portfolio.ui.MediaCenterController.event(MediaCenterController.java:431)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:246)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:243)
>>> stack of 3.cause::org.hibernate.exception.ConstraintViolationException: could not execute statement
-> at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:112)
   at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
   at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
   at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
   at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:207)
   at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
   at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3246)
   at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3483)
   at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:99)
   at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:582)
   at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:456)
>>> stack of 4.cause::org.postgresql.util.PSQLException: ERROR: update or delete on table "o_pf_media" violates foreign key constraint "pf_page_media_idx" on table "o_pf_page_part"