% A second callout in the figure must dirty the build.
\documentclass[border=2pt]{standalone}
\usepackage[en]{superfig}
\sfsetrole{x}{sfTeal}
\begin{document}\begin{tikzpicture}
\sfrow{R1}{10mm}
  \sfnode[role=x]{A}{A}{12mm}{8mm}
\sfrowend
\sfrow{R2}{10mm}
  \sfnode[role=x]{B}{B}{12mm}{8mm}
\sfrowend
\sfcallout{N1}{3cm}{R1}{one}{first}
\sfcallout{N2}{3cm}{R2}{two}{second}
\end{tikzpicture}\end{document}