My model is a dynamic model with three endogeneous variables (that is three equations). The unit root test is a mixture of i(1) and i(0). I cannot use PVECM because of the unit root result and i cannot use VAR beacuse of possible cointegration among the models. So, i need to perform BOUND TEST of cointegration to know the cointegration status of the models. But i don't know the stata code for executing BOUND TEST of cointegration.