Dear Taco, the following minimal example: \usemodule[bib] \startpublication [k=key,t=book] \title{Title} \author[]{Author}[A.]{}{The} \stoppublication \starttext \cite[alternative=data][key] \stoptext creates an error in mkii (and works fine in mkiv): ! Undefined control sequence. \@@pvdatabook ...up }{\egroup . }{\insertcrossref { in~}{}{. }}}{\insertseri... \dotypesetapublication ...ve {\getvalue {pbdt-#1}} \fi \egroup \next1 #1,->\dobibdata {#1} \doprocesscommaitem \doprocesscommalist ...item \gobbleoneargument #1, ]\relax \global \advance \... \bibdataref ...e \processcommalist [#1]\dobibdata \bibalternative \v!right \docite ...alue {bib\@@currentalternative ref}[#2] \else \processcommalist [#... l.12 \cite[alternative=data][key] ? Mojca