Dear all,

I am having problems with subformulas.

The following example does not display a subnumber (i.e. I get (1) and (2) 
instead of (1a) and (1b)):

%%%%%%%%%%%%% start example %%%%%%%%%%%%
\starttext
% from 
% does not display "subformula numbers""
\placesubformula
\startformula \startalign
\NC a_1 x + b_1 y \NC = c_1 \NR[+][a]
\NC a_2 x + b_2 y \NC = c_2 \NR[+][b]
\stopalign \stopformula
%%%%%%%%%%%%% stop example %%%%%%%%%%%%%

This example is taken from http://dl.contextgarden.net/myway/mathalign.pdf page 
6 

I am not quite sure for how long this is not working. I have been using the 
following alternative, which used to work but now gives me an error with the 
latest beta (ConTeXt ver: 2012.08.16 22:20 MKIV fmt: 2012.8.18):

%%%%%%%%%%%%% start example %%%%%%%%%%%%
% the following used to work in an earlier version
\startsubformulas[eq:ax=b]
\placeformula
\startformula \startalign
\NC a_1 x + b_1 y \NC = c_1 \NR[+][a]
\NC a_2 x + b_2 y \NC = c_2 \NR[+][b]
\stopalign \stopformula
\stoptext
%%%%%%%%%%%%% stop example %%%%%%%%%%%%%

Any suggestions?

Cheers,
Andreas
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