I use Relativity in all environments, Windows and Unix/Linux, RM, Micro Focus and Visual COBOLs. I am typically in an RM/COBOL environment, but there is no operational difference - only the underlying COBOL fie manager is different. In fact, Relativity for Micro Focus COBOL predates Visual COBOL by more than a decade.
I would have to see the FD and Table representations from the Designer to understand your particular issue. I would also use something like ODBCTest (the Microsoft version here and download from here) to check the actual columns that are being reported on the table.
Have you made this table INSERT-able or UPDATE-able?