You can start itemize only in vertical mode.  To switch to vertical mode use 
\blank.  To kill the empty line which is inserted use \blank[-line].

\starttext
\startitemize[n]
\item \blank[-line]
\startitemize[a,horizontal,three]
\startitem First \stopitem
\startitem Second \stopitem
\startitem Third \stopitem
\startitem Fourth \stopitem
\stopitemize
\item On the outer level
\stopitemize
\stoptext

On 09/18/2016 10:54 AM, Mikael P. Sundqvist wrote:
> Hi
> 
> 1) the following code
> 
> \starttext
> \startitemize[n]
> \item
> \startitemize[a,horizontal,three]
> \startitem First \stopitem
> \startitem Second \stopitem
> \startitem Third \stopitem
> \startitem Fourth \stopitem
> \stopitemize
> \item On the outer level
> \stopitemize
> \stoptext
> 
> generates the error
> 
> tex error       > tex error on line 9 in file
> /home/mickep/tmp/ctx-listexample14.tex: ! You can't use `\prevdepth'
> in restricted horizontal mode
> 
> Isn't it possible to have nested itemize with key horizontal?
> 
> 2) If I change the horizontal key to columns, then there is an extra
> line (the extra line in nested itemization has been discussed before,
> but not with these keys given, as far as I could see). I.e. the file
> 
> \starttext
> \startitemize[n]
> \item
> \startitemize[a,columns,three]
> \startitem First \stopitem
> \startitem Second \stopitem
> \startitem Third \stopitem
> \startitem Fourth \stopitem
> \stopitemize
> \item On the outer level
> \stopitemize
> \stoptext
> 
> gives the attached pdf file, where I would have exptected the first a.
> in the inner itemize to be on the same line as the 1. in the outer
> itemize.
> 
> Anyone has an idea on what is going on here?
> 
> Best regards, Mikael
> 
> 
> 
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> ___________________________________________________________________________________
> 

___________________________________________________________________________________
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Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : http://foundry.supelec.fr/projects/contextrev/
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