[NTG-context] problems with uppercase Greek letters in math

Hello, The uppercase Greek letters in the following example don't work since the letters are taken from ec encoding, while the default TeX encoding is assumed in the definitions of Phi, Psi, ... ("mr", math roman font) Any suggestions how to fix this strange behaviour? Thanks a lot, Mojca \starttypescript [something] [ec,texnansi] \definetypeface [somename] [rm] [serif] [modern] [default] [encoding=\typescripttwo] \stoptypescript \usetypescript[something][ec] \setupbodyfont[somename,rm] \starttext $\Psi\Phi\Lambda$ \stoptext