Many thanks Wolfgang, that did the trick!

Christian

PS.: Hope Hans will get this fix in the distribution

Am Sa., 22. Feb. 2025 um 17:21 Uhr schrieb Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>:
Am 22.02.2025 um 16:24 schrieb Christian Prim via ntg-context:
> Following example (taken from the wiki) produces an error with lmtx:
>
> \definetabletemplate[booktabs][o0|l|l|ro0|]
> \starttable[booktabs]
>          \NC first column \NC second column \NC third column \NC \AR
> \stoptable
>
> Following example works:
>
> \starttable[o0|l|l|ro0|] %same as above, but without the use of the
> defined template
>          \NC first column \NC second column \NC third column \NC \AR
> \stoptable
>
> I know that this table-environment is deprecated. But it is best suited
> for my project. I love the use of the template with this environment.

Comment the line with the \catcode command in tabl-tab.mkxl and remake
the format file (context --make).

% tabl-tab.mkxl
\permanent\protected\def\definetabletemplate % to be redone
   {\bgroup
   %\catcode\barasciicode\othercatcode
    \tabl_table_define_template}

Wolfgang

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