This Discussion Request proposes the introduction of 507 and 507C market messages for Designated DUoS Disputes where the Supplier disputes amount exceeds 5% of the total invoice in NI as per the NIE Distribution Use of System Agreement. This will remove the currentmanual NI dispute process where a Supplier has to e-mail NIE through the customer account e-mail account. Note smaller amounts will still behandled off-line using the current manual process. 507C must always be sent by a Supplier regardless whether or not there are any Designated Disputes.

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