RS import a course with several same relations area to group

ERROR SqlExceptionHelper  - Duplicate entry '446758988-447807489' for key 'group_fk'
ERROR OLATRuntimeException  - OLAT::ERROR ^%^ N1-E3103 ^%^ org.olat.core.logging
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 ^%^
**RedScreen** org.hibernate.exception.ConstraintViolationException: could not execute statement
<dispatchinfo>
	<componentinfo>
		<compname>cmd.forward</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>cmd.forward</command>
			<tostring>com:cmd.forward,org.olat.core.gui.control.Event@48b4a30</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.repository.controllers.RepositoryCopyController</controllername>
		<controllername>org.olat.repository.controllers.RepositoryDetailsController</controllername>
		<controllername>org.olat.repository.controllers.RepositoryMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.controller.simple.SimpleBaseController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.BaseChiefController</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:115)
   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:516)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:228)
   at org.olat.core.gui.components.Component.dispatchRequest(Component.java:192)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:241)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:197)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:261)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:197)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>>>stack of 2.cause::javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
-> at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387)
   at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310)
   at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:277)
   at org.olat.properties.PropertyManager.findProperties(PropertyManager.java:477)
   at org.olat.properties.PropertyManager.findProperties(PropertyManager.java:415)
   at org.olat.properties.PropertyManager.findProperty(PropertyManager.java:568)
   at org.olat.group.manager.BusinessGroupPropertyDAO.findProperty(BusinessGroupPropertyDAO.java:186)
   at org.olat.group.manager.BusinessGroupPropertyDAO.updateDisplayMembers(BusinessGroupPropertyDAO.java:101)
   at org.olat.group.manager.BusinessGroupImportExport.importGroups(BusinessGroupImportExport.java:321)
   at org.olat.group.manager.BusinessGroupServiceImpl.importGroups(BusinessGroupServiceImpl.java:1727)
   at org.olat.course.groupsandrights.PersistingCourseGroupManager.importCourseBusinessGroups(PersistingCourseGroupManager.java:367)
>>>stack of 3.cause::org.hibernate.exception.ConstraintViolationException: could not execute statement
-> at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:74)
   at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
   at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
   at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
   at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:189)
   at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:58)
   at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3079)
   at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3521)
   at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:88)
   at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:393)
   at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:385)
>>>stack of 4.cause::com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '446758988-447807489' for key 'group_fk'
-> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
   at java.lang.reflect.Constructor.newInstance(Unknown Source)
   at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
   at com.mysql.jdbc.Util.getInstance(Util.java:386)
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4190)
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4122)
   at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)