  The structure of the hadronic final state in deep inelastic scattering at
HERA is studied on the level of the Monte Carlo event generator. Special
emphasis is given to the colour coherence phenomenon in the current
fragmentation region. It is shown that results of perturbative QCD recently
tested in $e^+e^-$ annihilation at LEP also describe production of hadrons in
current fragmentation region of deep inelastic scattering.
