Why don't you show us how each of the fields were defined; what the content of the sending field was. Also how did you view the receiving field to determine that it was "unpopulated"? Let me know about this.
i think you are trying to display COMP-3 field after populating and saying it is not populating. If it is so you are wrong. we can't see COMP-3 values directly. If it is in file view the value in Hexadecimal format. if it is in sysout try to move it to disp field and display it.