Complex parameter binding lost

[mengjia@…]

Hi look,

model Test
  model Complex_bindinglost
    constant Real pi = Modelica.Constants.pi;
    parameter Real eterm = 0.999999 "terminal voltage";
    //1.0
    parameter Real anglev0 = 4.0463 "Power flow, node angle in degree";
    parameter Real pelec = 0.399989 * 100 "active power MVA";
    //80.0
    parameter Real qelec = 5.41649 "reactive power MVA";
    //50.0
    parameter Real wbase = 2 * pi * 50 "system base speed";
    parameter Real mbase = 100 "system base power rating MVA";
    parameter Real Ra = 0 "amature resistance";
    parameter Real Xpp = 1;
    parameter Real anglev_rad = anglev0 * pi / 180 "initial value of bus anglev in rad";
    parameter Real p0 = pelec / mbase "initial value of bus active power in p.u.";
    parameter Real q0 = qelec / mbase "initial value of bus reactive power in p.u.";
    parameter Complex Zs(re = Ra, im = Xpp) "Equivation impedance";
    parameter Complex VT(re = eterm * cos(anglev_rad), im = eterm * sin(anglev_rad));
    parameter Complex S(re = p0, im = q0);
    parameter Complex It = conj(S / VT);
    //Initialize current and voltage components of rotor reference fram (dq axes).
  end Complex_bindinglost;

  model Complex_bindingOK
    constant Real pi = Modelica.Constants.pi;
    parameter Complex ZsOK(re = 1, im = 1) "Equivation impedance";
    parameter Complex VTOK(re = cos(pi), im = sin(pi));
    parameter Complex SOK(re = 1, im = 1);
    parameter Complex ItOK = conj(S / VT);
    annotation(Icon(coordinateSystem(extent = {{-100, -100}, {100, 100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2, 2})), Diagram(coordinateSystem(extent = {{-100, -100}, {100, 100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2, 2})));
  end Complex_bindingOK;
  annotation(Icon(coordinateSystem(extent = {{-100, -100}, {100, 100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2, 2})), Diagram(coordinateSystem(extent = {{-100, -100}, {100, 100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2, 2})));
end Test;

Check that the value of It is zero but ItOK got its value (not zero)
why ?
Thanks :)