How to pass a value from backend to UI

Hi Experts,

I have a table view with editable cells. I enter something into a cell of the table column(say 8.7) and press enter or a button to round off the entered value using some function module in the backend say call function 'zxyz'

                              exporting iv_cell1 = '8.7'

                              importing ev_cell1 = lv_cell1.  "(Here lv_cell1 is 9.0).

I want this value i.e. lv_cell1 value which is 9.0 here to be set on the UI. In short, I want to send a value from any function module from the backend to be set on UI. How to achieve it?

Regards,

Shahir Mirza