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We analyse the constraints from supersymmetry on $ \nabla^4 R^4$ typecorrections to the effective action in $\mathcal{N}=2$ supergravity in eightdimensions. We prove that there are two classes of invariants that descendrespectively from type IIA and type IIB supergravity. We determine the firstclass as $d$-closed superforms in superspace in eight dimensions, whereas weobtain the second class by dimensional reduction down to four dimensions, inwhich there is a single class of invariants transforming in the next to minimalunitary representation of $E_{7(7)}$.

$\mathcal{E} \nabla^4 R^4$ type invariants and their gradient expansion