[en] The effect of nucleon identity on the choice of the vertex functions of the Feynman diagrams and the signs of pole diagrams for elastic scattering are discussed. The pole diagrams for the A+x → B+y reactions (A and y are nuclei; B and x are nuclei or nucleons) have been plotted. The matrix element describing the cluster pickup in the plane wave approximation has been calculated. Pole diagram amplitudes have been determined with the vertex functions incorporating normalization factors proportional to the Fourier components of overlapping integrals in the respective Faddeev components of wave functions . It is concluded that the pole amplitude is included in the matrix element of elastic X scattering on A with an additional sign factor (-1)sup(Ax) (-1)sup(21x). The factor (-1)supCAx) equals unity when x is a nucleon or triton. It may be important when the pole amplitude is added to other amplitudes or is part of the kernel of the integral equation for total scattering amplitude, in this case the total amplitude will incorporate both even and odd pole amplitude powers and the result will depend upon the pole amplitude sign