Hi, I have a counter which I want to be incremented after every \section command and reset after every odd \section (don't ask why...). So I tried this approach: \setuphead[section] [command={{{\determineheadnumber[section]} \ifodd{\currentheadnumber[section]}\resetSlideNumber \incrementSlideNumber \else\incrementSlideNumber \fi}] But I'm getting errors: ! Missing number, treated as zero. <to be read again> { \@@kosectioncommand ...adnumber [section]}\ifodd { \currentheadnumber [sectio... \doplaceheadnumbertext ...ue {\??ko #1\c!command } {\dostartattributes {\??ko... \dodododoconstructhead ...{\finalsectionnumber }}} \writesection {#1} {#3}{#4}... Any pointers? Thomas