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It is shown that for the theoretical description of the magnetic andstructural phase transitions in the magnetics with magnetoactive ions oftransition metals within the framework of the Landau theory of phasetransitions the exchange group GxO(3) should be chosen as the group of symmetryof paramagnetic phase. Such a choice allows to describe the transition from theparamagnetic phase into the isotropic magnetically ordered phase (at Tc), andthe spin-orbit transition from the isotropic into the anisotropic phase (atT<Tc). The exchange multiplet describes the spin-orbit phase transition.

The problem of choosing of the group of symmetries of paramagnetic phase in the theory of magnetic phase transitions and the exchange multiplets