I find that this is the portion of the source code for plant equipment operation schemes responsible for this.

case openstudio::IddObjectType::OS_PlantComponent_UserDefined:
{
  return ComponentType::BOTH;
}

Is there a way to have the componentType being recognized based on the plantloop looptype or the plantloadingmode for the PCUD object ( for example if the loading mode is set to MeetsLoadWithNominalCapacityHiOutLimit then the componenttype is set to heating)