The "source" in a Desktop project is the file/table providing the data. The act of loading
data into a geodatabase changes the format of the data to "geodatabase" (in this case,
an Access personal geodatabase). There is no reason for a table to care how it came to
be populated (it won't change how the rows are accessed), and therefore no way to store
this as part of the table (save through the use of metadata, which is stored elsewhere).
- V