The following error can be seen in the log :
[05.10.2015 09:12:53] [ListItem] [1_.000] Progress: Importing
[05.10.2015 09:12:53] [ListItem] [1_.000] Verbose: List URL: /workspace_sites/PublishingDeviceChannelErrorTest/DeviceChannels
[05.10.2015 09:12:55] [ListItem] [1_.000] Error: The list item could not be added or updated because duplicate values were found in the following field(s) in the list: [Alias].
[05.10.2015 09:12:55] [ListItem] [1_.000] Debug: at Microsoft.SharePoint.SPListItem.AddOrUpdateItem(Boolean bAdd, Boolean bSystem, Boolean bPreserveItemVersion, Boolean bNoVersion, Boolean bMigration, Boolean bPublish, Boolean bCheckOut, Boolean bCheckin, Guid newGuidOnAdd, Int32& ulID, Object& objAttachmentNames, Object& objAttachmentContents, Boolean suppressAfterEvents, String filename, Boolean bPreserveItemUIVersion)
at Microsoft.SharePoint.SPListItem.UpdateInternal(Boolean bSystem, Boolean bPreserveItemVersion, Guid newGuidOnAdd, Boolean bMigration, Boolean bPublish, Boolean bNoVersion, Boolean bCheckOut, Boolean bCheckin, Boolean suppressAfterEvents, String filename, Boolean bPreserveItemUIVersion)
at Microsoft.SharePoint.SPListItem.MigrationAddOrUpdate(Boolean bAddNew, Boolean bIsPublish, Guid newGuidOnAdd, Boolean bNoVersion, Boolean suppressAfterEvents)
at Microsoft.SharePoint.Deployment.ListItemSerializer.SetObjectData(Object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
at Microsoft.SharePoint.Deployment.XmlFormatter.CallSetObjectData(Object obj, SerializationInfo objectData, ISerializationSurrogate surrogate, ISurrogateSelector selector)
Solution: The error can be ignored . This occurs in all lists and list elements in which a duplicate detection is active .