# breqn override dgroup number

Is there a way to override the base number in breqn's dgroup environment? Take the following example:

\documentclass{article}
\usepackage{breqn}

\begin{document}

\begin{dgroup}[number={2}]
\begin{dmath}
a=b
\end{dmath}
\begin{dmath}
c=d
\end{dmath}
\end{dgroup}

\end{document}


this produces something like

a=b   (0a)
c=d   (0b)


a=b   (2a)
c=d   (2b)


I know I can achieve the same effect with

\begin{dgroup}
\begin{dmath}[number={2a}]
a=b
\end{dmath}
\begin{dmath}[number={2a}]
c=d
\end{dmath}
\end{dgroup}


But I'd rather not have to do that.

I'm not sure if this is the best solution (and doesn't override a dgroup parameter as implied in the question), but you can set the equation counter directly. For instance,

\setcounter{equation}{1}
\begin{dgroup}
\begin{dmath}
a=b
\end{dmath}
\begin{dmath}
c=d
\end{dmath}
\end{dgroup}


produces the desired result. Presumably, dgroup uses and increments the equation counter which is why this yields the numbering (2a) and (2b).