Referenced tablefield in buffer/debug but not displaying on form

We have 2 custom tables. Table Y references to X via a cmba (combined) field. Similar to b4 tdsls045 (Y) referencing tdsls041 (X).

I created a session type 3 based on table Y. Added some fields to the form from Table X. They do not display.

1 - In debug, table X values are in buffer, but not displayed on form....
2 - Added display("xxxxx.xxxx") in several UI sections, but then strangely, the buffered field value (enum) is reset to zero immediately after the call (in Debug)

The session simply refuses to display tablesfields from X on the form. Created a brand new session. Same behavior. Disabled the DAL. Still persists.

I'm out of ideas. Any clues?
Cheers