Real interpolation of vector-valued spaces in non-diagonal case

It is shown that the formula (l(p0)(s0) (A(0)),..., l(pn)(sn) (A(n))) ((theta) over right arrow ,q) = l(q)(s)((A(0),..., A(n)) ((theta) over right arrow ,q)), where (theta) over right arrow = (theta(0),...,.n) and s = theta(0)s(0)+...+theta(n)s(n) is correct under the restrictions A(n-1) = A(n) and s(n-1) not equal s(n). It is also true if we suppose that A(n) = (A(0), A(1),..., A(n-1)) ((lambda) over right arrow ,p), s(n) not equal lambda(0)s(0) + lambda(1)s(1) +... + lambda(n-1)s(n-1), and the spaces A(0), A(1),..., A(n-1) are functional Banach or quasi-Banach lattices on the same measure space (Omega, mu).