Hi everybody, Preparing a document with a adapted header and TOC layout I encountered the following problem: \setuphead[section][prefix=Gedicht] generates the following error: pdfeTeX, Version 3.14159-1.00b-pretest-20020211-2.1 (Web2c 7.3.7x) (format=cont-en 2002.10.20) ConTeXt ver: 2002.10.2 fmt: 2002.10.20 int: english mes: english ... section : 1 Spaanse versie ! Undefined control sequence. <argument> \localkopprefix \setupreferenceprefix [#1]->\edef \@@rfprefix {#1 }\ifx \@@rfprefix \empty \l... \dodododosomekop ...renceprefix [\localkopprefix ] \fi \dosomebreak \nobreak ... l.22 \section{Spaanse versie} Using \def\Gedichthead%... and \setuphead[section][command=\Gedichthead] works fine. What is wrong with using the prefix operator? In the document also the TOC should be adapted: \setuplist[section][left=Ged.~,right=] There is no error on this statement. However the prefix of the line with 'Ged.' does not show. May be that I miss something in this approach? Please find attached a minimal test file. Cheers Willi