Naturally vanishing cosmological constant in N=1 supergravity

For N=1 supergravity theories we show that the choice of a particular class of Einstein spaces for the Kaehler manifold of the hidden sector leads to a vanishing cosmological constant without unnatural fine tuning. The total scalar potential from the hidden and physical sector is positive definite. The resulting low energy softy broken global supersymmetry for the matter fields is thus the same as in the case of factorized superpotential models with a flat Kaehler metric. (orig.)