[NTG-context] Pagenumbering in header-margin with outer-align

Hi, I am trying to put the pagenumber in the margin of the header. But I also want it outer-aligned - not inner-aligned, which seems to be the standart alignment of margin. But the inner-align of the body-margin should still be inner-aligned. So I tried following: \setuppagenumbering[conversion=Romannumerals,alternative=doublesided, location={header,margin},style={\setupalign[outer]}] but Context dont like this.. it stops converting. Does anyone know a working solution for this problem? Thanks, P.