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LabVIEW Control Design can't multiply an improper TF with a proper TF

I'm calculating a dynamic inversion where I need to multiply two transfer functions,

 

H = inv(G1)*G2.

 

All transfer functions G1 G2 and H are proper. However, inv(G1) is improper. Even though the resulting H is proper LabVIEW's Control Design tool fails to perform the multiplication complaining that one of the systems is improper. Works fine in Matlab.

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