[NTG-context] \type-|- within tabulate?

Using \type-|- in a \starttabulate ... \stoptabulate environment I get: [..] Runaway argument? - \NC $\Pattern _{m1}\ldots \Pattern _{mn_m}$ \term {->} $\Expr _m$ \NC \ETC. ! Forbidden control sequence found while scanning use of \next. <inserted text> \par <to be read again> \endtemplate <template> ...atehss \egroup \egroup \endtemplate \processtabulate ...cr \fulltabulatecontent \crcr }}\ifnum \nofautotabulate ... l.366 \stoptabulate ? whereas when I use it outside, it gives me just what was intended. Any ideas and hints are welcome Marko