[LISREL 8.7] syntax for a formative second order model

Hi:

I am developing a scale, which is theoretically a first order reflective, and second order formative model.
I have already analyzed the first order model and everything's ok, and results indicate that i should continue with a second order formative model.
I do not know how to write the syntax of the formative model, neither how to check that the results are acceptable.

I would really appreciate if anyone could help me with this.

Thanx in advance.