How to get the field name dynamically and update it to main table in progress

Program:It is a just maintenance program, in this one it displays the Item Code in one frame and it prompt for the input. if you enter the item code it has to displays what are the blank fields for that record in pt_mstr and display in one frame(No need to display all blank fields, just first 4 or 5 fields enough). and also in that frame only if user want to update it update directly to main table pt_mstr.

What i tried is, i just write the code for getting blank fields using buffer handle and after that i create one temp table and displaying the fields, i strucked there itself, i am unable to update fields.

My code:

/*Sample Item master Maintenance Program*/
/* DISPLAY TITLE */
{us/mf/mfdtitle.i "3+ "}
DEFINE VARIABLE hBuffer AS HANDLE NO-UNDO.
DEFINE VARIABLE i AS INTEGER NO-UNDO.
DEFINE VARIABLE j AS INTEGER NO-UNDO.
DEFINE VARIABLE hField AS HANDLE NO-UNDO.
define variable fldnm as character extent 10 no-undo.
define temp-table tt_temp no-undo
field tt_part like pt_part
field field1 as char extent 10.
form
pt_part colon 25
with frame a side-labels width 80.
setFrameLabels(frame a:handle).
/* DISPLAY */
view frame a.
repeat with frame a:
prompt-for pt_part
editing:
/* FIND NEXT/PREVIOUS RECORD */
{us/mf/mfnp.i pt_mstr pt_part "pt_mstr.pt_domain = global_domain and pt_part" pt_part pt_part pt_part }
if recno <> ? then
do:
display pt_part.
find pt_mstr where pt_part = input pt_part and pt_domain=global_domain no-lock no-error.
ASSIGN hBuffer = BUFFER pt_mstr:HANDLE.
empty temp-table tt_temp.
j = 1.
DO i = 1 TO 10:
ASSIGN hField = hBuffer:BUFFER-FIELD(i).
IF ((hField:BUFFER-VALUE = "" )) THEN
do:
/* message hField:NAME "test" view-as alert-box.*/
find first tt_temp where tt_part = pt_part no-lock no-error.
if not avail tt_temp then
do:
create tt_temp.
assign
tt_part = pt_part
field1[j] = hField:NAME.
j = j + 1.
end.
else do:
assign
field1[j] = hField:NAME.
j = j + 1.
end.
end.
end.
end.
for each tt_temp:
display field1[1] field1[2] field1[3] field1[4].
end.
end.
end.

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