HOW TO UPDATE DATABASE TABLE ENTRIES in PARTICULAR FIELDS

hi everybody,

Table PLAF fields are plnum and AUFFX.

in plaf table plnum is the planned order number and AUFFX is the firming Indicator ( X or SPace).

first i am selecting the plnum from table plaf with AUFFX = 'X' and displaying in table control.

upto here working fine.

if user selects particular plnum and press close button on screen i need to set AUFFX = SPACE.

and this should be update to PLAF table.

through programming can i update database table? if its possible how to do?