Using "LOOP AT itab ASSIGNING ." instead of using a work area (either explicit or via header line) you avoid data transport into the work area. The field symbol is a pointer into(!) the table so that you can modify the table line directly; you don't need MODIFY thus avoiding another data transport.
types: begin of rec_type,
count type i,
string(1024) type c,
end of rec_type.
types tab_type type rec_type occurs 0.
data itab type tab_type.
data wa type rec_type.
field-symbols type rec_type.
do 1000 times.
append wa to itab.
loop at itab assigning . " pointer
-count = sy-tabix. " modify itab
-string = 'x'. " without MODIFY
This was first published in December 2001
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