Error in partition switching in SQL Server 2014 when migrating a database from SQL Server 2005
Actually, I think this is the opposite of a bug. the 2008 document states "Source and target tables must share the same filegroup" but it looks as though they only started paying attention to their rules in 2014. This article (made for 2014 / 2016 CTE) states "The corresponding indexes, or index partitions, must also reside in the same filegroup" TechNet