When 2+ kits produce discount lines with the same unit price and VAT rate,
adauga_articol_comanda raises RAISE_APPLICATION_ERROR(-20000) on the duplicate
(ID_ARTICOL, PTVA, PRET, SIGN(CANTITATE)) check. Defer discount insertion
until after the main article loop, accumulating cross-kit discounts and merging
collisions by summing qty. Different prices remain as separate lines.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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