How do I change a measurment unit in a Simscape custom block?

I'm trying to create a custom block in Simscape that convert energy from pressurized water into a torque. Here is my code:

component pelton_turbine
% Ce composant calcule le couple généré par l'eau sur la turbine.

% 🔹 Déclaration des ports
nodes
    H = foundation.hydraulic.hydraulic; % Port hydraulique
    R = foundation.mechanical.rotational.rotational; % Port mécanique rotatif
end

% 🔹 Déclaration des paramètres
parameters
    eta = {0.85, '1'};      % Rendement de la turbine
    rho = {1000, 'kg/m^3'}; % Densité de l'eau
    r = {0.5, 'm'};         % Rayon moyen de la roue
    g = {9.81, 'm/s^2'};    % Gravité
end

% 🔹 Déclaration des variables internes
variables
    Q = {0, 'm^3/s'};
    T = {0, 'N*m'};  % Couple généré
    H_head = {0, 'm'}; % Hauteur d'eau équivalente
end

branches
 % Débit hydraulique pris directement depuis le port H
    Q : H.q -> *;
end

equations

    % Calcul de la hauteur d'eau (pression convertie en mètre de colonne d'eau)
    H_head == H.p/ (rho * g);

    % Calcul du couple généré par l'eau
    T == {eta * rho * Q * r * sqrt(H_head * 2 * g), 'N*m'}; 

    % Transmission du couple à l’axe mécanique
    R.t == T;
end

end

My problem is that I have this error when I try to build my component:

Invalid use of a value with unit cm^3*kg/(m*s^2) when attempting to bind a unit.
The value to which the unit is bound must not have an associated unit.
   • In pelton_turbine.pelton_turbine (line 36)
   eta = 0.8500
   rho = {1000, 'kg/m^3'}
   Q = {[1x1 double], 'cm^3/s'}
   r = {0.5000, 'm'}
   H_head = {[1x1 double], 'm'}
   g = {9.8100, 'm/s^2'}

I don't get why the flow rate (Q) is in cm^3/s instead of m^3/s and I don't know how to change it. Do you have an idea ?

Since Q is a through variable I can't define his unit. I also tried changing the units in the Configuration Parameters in my .slx file (I changed cm^3/s into m^3/s for the flow rate) but it didn't have any effect on my .ssc file and I keep getting the error.