Actually the imaginary impedance does work if you're using Flexible Balance.Originally posted in cdnusers.org by adbeckett
A complex impedance can be simulated in the frequency domain, but in a time domain based analysis such as PSS in shooting mode, a non-varying complex impedance is non-causal. If you think about it, it is completely non-physical, and representing this in the time domain is impossible - you simply do not get constant complex impedance over all frequencies, which is what the time domain representation would have to do.
In a frequency domain simulation, the fact that it is non-physical does not present problems (of course, the results may not make any sense outside a relatively narrow band, depending on the application).
So it can't really be fixed for PSS in shooting mode, for the reasons I've stated above.