MDX differences between TM1 Database 12 and TM1 Database 11

There are significant differences between the MDX engine in TM1 Database 12 and TM1 Database 11. There are several categories of new functionality, changes to MDX query processing, and some MDX functions (largely TM1-specific functions) that are no longer supported.

See these topics for more information about the differences between TM1 Database 12 and TM1 Database 11.