% A callout inside an open row is a package error.
\documentclass[border=2pt]{standalone}
\usepackage[en]{superfig}
\sfsetrole{x}{sfTeal}
\begin{document}\begin{tikzpicture}
\sfrow{R1}{10mm}
  \sfnode[role=x]{A}{A}{12mm}{8mm}
  \sfcallout{N}{3cm}{R1}{t}{b}
\sfrowend
\end{tikzpicture}\end{document}