IRF graph and relationGDP=C+I+G+X-M

Hi,
I have one question with regard to irf functions. I plot responses of GDP, C, I, G, X, M. Why does not hold relation GDP=C+I+G+X-M on irf grapf??
Thanks for answer.
Jan
I have one question with regard to irf functions. I plot responses of GDP, C, I, G, X, M. Why does not hold relation GDP=C+I+G+X-M on irf grapf??
Thanks for answer.
Jan