  Recent sum rule analyses on the <VV-AA> two-point correlator have led to
significant discrepancies in the values found for the OPE condensates, most
dramatically in the dimension eight condensate and to a lesser extent in the
dimension six one. Precise knowledge of these condensates is of relevance in
kaon decays and therefore it seems mandatory to assess the actual impact of
what is commonly neglected in spectral sum rules, most prominently the issue of
duality violations. We will explicitly compute them in a toy model and show
that they are a priori non-negligible.
