https://support.microsoft.com/en-au/topic/kb3019110-fix-duplicate-names-are-not-allowed-error-when-you-add-multiple-filters-to-the-power-view-report-in-sharepoint-2013-007e899a-f378-4bf2-d8fe-86a68f8c4869
KB3019110 - FIX: "Duplicate names are not allowed" error when you add multiple filters to the Power...
Fixes an issue that occurs when you use Power View in SharePoint 2013. This issue occurs when the SQL Server version is SQL Server 2012 SP2 or SQL Server 2014.