Build Waveform, SI Module Residual Analysis, System Identification MIMO

Hi, I have a question stemming from this page, with the residual analysis model: http://zone.ni.com/reference/en-XX/help/372458D-01/lvsysidconcepts/case_study_validating/#Simulation_and_Prediction

So this is for ARX, a SISO function. I want to do the same with a State Space MIMO function. I'm having some trouble with the Build Waveform, the types for the waveform doesn't match up. It appears there's another dimension to the autocorrelation/crosscorrelation, which is causing some issue. Is there a way I can do this with a MIMO so I can build the waveform?

Thanks,

Andrea