I was trying to use the Microsoft SQL Server system data type Hierarchyid. This data type is extremely useful for data that contains some kind of hierarchy. For example multi level BOM structures. However, when I set up a domain as a DTTP my context couldn't handle it and later on the mobile GUI wouldn't even start since it couldn't handle this data type(said the error log). My question is if someone can confirm that this data type is not supported by the GUI's (Web, Windows and Mobile)? If so I will submit an idea with further explanation why I think this is a useful feature.
See this link for more information about the data type: Hierachyid