What kind of function calls are supported from within State Transition Tables?

I've read here that "State Transition Tables do not support chart-level functions (graphical, truth table, MATLAB, and Simulink)".

Does it mean they don't support any kind of function call in condition/action statements? I guess I may at least call some external C/C++ custom code, but I think this is not really the best way to go, because of limitations about requirements traceability.

[Luca Barbiero]

Pheraps I can define MATLAB/Truth Tables/Simulink blocks at the parent model level, and then get those to communicate with the State Transition Table block by mean of input triggers and function call outputs?