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The problem may be that with 2SLS the identities should not be included in the estimation. So the final equation that states the identity should be removed -- you then have two equations in the system.

If you are trying to estimate a system of equations then you can follow the example commands given in the SHAZAM User's Reference Manual Version 10 (page 331 of the Black cover manual; page 335 of the purple cover manual).

Note that the description states: All identities have already been substituted.