It's a repost. Does anybody have an idea to solve this problem? If not, I'm going to buy the TeXbook... I try to expose the problem a bit clearer: \newcount\MyVersion \def\MyMacro#1{% This macro is somewhere in an environment file. \getgparameters[XXX][#1] \global\advance\MyVersion by 1 \bTR \expanded{\bTD \the\MyVersion \eTD} \expanded{\bTD \XXXNumber \eTD}\eTR } \def\MyNumber#1#2#3{% This macro is a special one for the document. \doifmode{aaa}{#1}\doifmode{bbb}{#2}\doifmode{ccc}{#3}} \enablemode[bbb] \starttext \bTABLE \bTR \bTD Version \eTD \bTD Number \eTD \eTR \MyMacro{Number=123} \MyMacro{Number=\MyNumber{111}{222}{333}} % error: Incomplete \iffalse \MyMacro{Number=456} \eTABLE \stoptext Greetings, Peter -- http://pmrb.free.fr/contact/