first get the total sting length by using srtlen command and then divide it with 132 then you get the number which you can use in DO loop
lv_string_lenth = strlen(p_text)
clear lv_off_begin.
lv_off_end(132)
DO n times
lv_text_132 = lv_org_text+lv_off_begin(lv_off_end)
lv_off_begin = lv_off_end
if lv_off_end LE lv_sting_length
lv_off_end = lv_off_end + 132
else.
lv_off_end = lv_sting_length
endif.
enddo
lv_test_132 will always have the text with 132 digits which you can pass to the header text.