  In this paper we continue to pursue a goal of finding the effective theory
for high energy interaction in QCD based on the colour dipole approach, for
which the BFKL Pomeron Calculus gives a low energy limit. The two key problems,
that we consider are the following: the probabilistic interpretation of the
BFKL Pomeron Calculus and the possible scenario for the asymptotic behaviour of
the scattering amplitude at high energy in QCD. In this paper we show that the
generating functional approach is equivalent to the BFKL Pomeron Calculus and
leads to a clear interpretation of this calculus as an alternative description
of the system of interacting colourless dipoles. We calculated the two BFKL
Pomerons into one BFKL Pomeron vertex directly in the dipole approach and show
that this merging can be described as the decay of two dipoles into four
dipoles in the dipole approach. This result means the JIMWLK approach can give
us all neeeded vertices for the BFKL Pomeron calculus and, therefore, they
together give the selfconsistent and complete theoretical approach to high
energy scattering in QCD.
