[Statistica] - Proportional Odds Assumption

Ordinal Logistic Regression from Generalized Linear/Nonlinear Models (Statistica Software) was used to forecast ordinal independent variable. Two models were built (forward and backward stepwise). Significant of coefficients, goodness of fit, correlation between dependent variables are acceptable for both of them. The last step is test of "Proportional Odds Assumption".
Could anyone help me with this item? I cannot find this test in Statistica.

I would be grateful for any comments on this topic.
Thank you.