Hi,

I think I am using the latest context version

 > texexec --version
TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 1997-2005

               texexec : TeXExec 5.4.3 - ConTeXt / PRAGMA ADE 1997-2005
               texutil : TeXUtil 9.0.1 - ConTeXt / PRAGMA ADE 1992-2006
                   tex : pdfeTeX, 3.141592-1.30.6-2.2 (Web2C 7.5.5)
             *  context : ver: 2006.03.20 10:19
               cont-en : ver: 2006.03.20 10:19  fmt: 2006.3.21  mes: 
english*

When I compile your  code, it works. However my code , which I think, is 
similar, doesn't work.
I  cannot see any difference in the setup. I must be doing something 
basically wrong ???

Here is an excerpt  from my code

*/\def\mathrm/*#1{ {*/\rm/* #1}}
*/\def\done/*#1#2{ */\frac/*{ */\mathrm/*{d}  #1}{*/\mathrm/*{d} */\mathrm/*{#2}} }
*/\def\dtwo/*#1#2{ */\frac/*{*/\mathrm/*{d}^{2}  #1}{*/\mathrm/*{d} */\mathrm/*{#2}^{2}} }
*/\starttext/*
Als op het tijdstip *$t_{0}$* plaats *$**\vec**{r}_{0}$* en snelheid *$v_{0}$* zijn gegeven, 
dan kan de plaats *$**\vec**{r}$* van een deeltje op ieder tijdstip worden berekend met de
vergelijkingen
*/\placeformula/*[eqn1]
*/\startformula/*
*/\startalign/*[n=3]
*/\vec/*{v} & = & */\done/*{*/\vec/*{r}}{t}    */\quad/* */\quad/* */\vec/*{r} - */\vec/*{r}_{0} = */\int/*_{t_{0}}^{t} */\vec/*{v} */\:/* dt */\\/*
*/\stopalign/*
*/\stopformula/*
*/\placeformula/*[eqn2]
*/\startformula/*
*/\startalign/*[n=3]
*/\vec/*{a} & = & */\done/*{*/\vec/*{v}}{t}    */\quad/* */\quad/* */\vec/*{v} - */\vec/*{v}_{0} = */\int/*_{t_{0}}^{t} */\vec/*{a} */\:/* dt  */\\/*
*/\stopalign/*
*/\stopformula/*
Voor *$**\vec**{a}$* constant volgt uit */\in/*[eqn2] 
*/\startformula/*
*/\vec/*{v} = */\vec/*{v}_{0} + */\vec/*{a} */\:/* (t - t_0)
*/\stopformula/*
en hieruit met behulp van */\in/*[eqn1] 
*/\stoptext
/*

Wim


adityam@umich.edu wrote:
> On Tue, 21 Mar 2006, WN wrote:
>
>   
>> Hi,
>>
>> I am getting unknown references when I use
>> \startformula
>> \startalign[n=3]
>> .... Some math ......
>> \stopalign
>> \stopformula
>> in conjunction with
>> \placeformula[eqn1]
>> \startformula
>> .... math ..
>> \stopformula
>> See \in[eqn1] .... <----------- unknown reference
>>
>> It has something to do with the formulanumber not set, I know, but how 
>> do I fix this in the above ??
>>     
>
> Which context version are you using? The following compiles correctly on 
> live.contextgarden.net
>
> \starttext
> \startformula \startalign[n=3]
>   \NC a \NC b \NC d \NR
>   \NC a \NC b \NC d \NR
> \stopalign \stopformula
>
> in conjunction with
> \placeformula[eqn1]
>   \startformula
>     a = b
>    \stopformula
> See \in[eqn1] \unknown
>
> \stoptext
>
> See if this works for you.
>
> Aditya
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