In 18.0 purchase.order.line uses purchase.triple.discount.mixin, not the
triple.discount.mixin this addon patches, so the purchase tests checked 16.0
behaviour. test_purchase_order now checks the 18.0 one plus what matters
here: the bill created from the PO keeps discount1..3, and editing one of
them on the bill keeps the others. test_triple_discount_mixin runs on an
invoice line, and no longer expects the values of the previous test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ca526d55cc
