Relative path in groups are not working

[sletz]

import("stdfaust.lib");

freq = vslider("../h:FREQ/Freq",200,200,1000,0.01);              // works (freq is shared by V1 et V2)
//freq = hgroup("../FREQ", vslider("Freq",200,200,1000,0.01));   // does not work 

process = hgroup("V1", os.osc(freq)), hgroup("V2", os.osc(freq));