Thermal Compatability Issue

Hello,

I created a PTC thermistor with VHDL. I have defined the thermal terminal as 

terminal TH   : THERMAL;

where THERMAL is of Kelvin units. However, all of the thermal components within SystemVision are of type Thermal_C, which is not compatible with the VHDL thermal. I assume that the incompatibility lies within the different units. Is there a workaround? 

John