That transform map is erroneous then.
There is a Global (global) table in the system, but it is never used to hold data, and it is never inherited by any other table. There is no single root table for the whole system.
The Global table is only there as a way to chose 'Global' in a table choice list. For example, the business rule's table field. To make a 'global' business rule, you need to point to the 'Global' table. It tells the system that the business rule is global, but that global table isn't used for anything else.
