On section conditions of E7(+7) exceptional field theory and superparticle in N=8 central charge superspace

We study the properties of section conditions of the E7(+7) exceptional field theory from the perspective of superparticle model in N = 8 D = 4 superspace enlarged by additional bosonic coordinates related to the central charge of the maximal supersymmetry superalgebra. In particular, the superparticle model suggests that only a part of the section conditions corresponding to generators of SU(8) subgroup of E7(+7) is independent, and we show that this part indeed suffices to obtain the (classical counterpart of the) general solution of the strong section condition.