[NTG-context] linking to equations with leqalignno?

Hello,

I am a bit lost. I am using this format for an equation:

-----------------------------------------------------------------
\placeformula[nohair]
\startformula
\leqalignno{
- M^{}_{\bullet}a^{2}_{\bullet} = & M^{}_{2} = -
\frac{J^{2}_{1}}{M^{}_{0}} \,, \cr
- M^{}_{\bullet}a^{3}_{\bullet} = & J^{}_{3} =
\frac{M^{}_{2}J^{}_{1}}{M^{}_{0}}\,. \cr
}
\stopformula
-----------------------------------------------------------------

but then,using  \in[nohair] to link to the equation in the text of the
document does not work.

I get a [??]

I think this is related to leqalignno, because \in[] works fine without it.

What should I do in this case?

thanks,

Pau
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