I am unable to use the \pn marker in the introductory outline \io. Strangely PT will allow \png which is a very similar marker. Imbedding it with a + doesn’t work either. Any suggestions?
According to the USFM stylesheet, \pn should be able to be inside a \io. In what way are you unable to use it? Which book are you trying this in? What happens if you force it there?