Yes. take a look at this website in pdf page 7
http://std.dkuug.dk/jtc1/sc2/wg2/docs/n2633r.pdf
If you notice, words =like ''sudah'', ''orang'' and anaknya has virama (we called it ''ma'') diacritic. Tough that're Indonesian but, certain word in buginese like ''padang'', ''barek'' and ''sallatang'' need this diacritic.
The underline technique is Andy Mallarangeng's idea, the first person to create the lontara software.
Thank you.
Muhammad Zainuddin