Single-Equation ECM

[backhaum]

Dear all,

I am trying to estimate a single equation error correction model with 4 exogenous variables but I am unable to correctly formulate the estimation command:

∆I = a + β_0*∆X_t - β_1*(I_t-1 - β_2X_t-1 + ε_t

1) Should I start with a VECM and then reduce it ? or
2) Should I estimate a single equation directly and if so how?

Thank you for your support...