XRechnung 2.5.0 · UBL
Rules: XRechnung Schematron rules by Koordinierungsstelle für IT-Standards (KoSIT) · Apache-2.0
Invoice line net amount MUST equal (Invoiced quantity * (Item net price/item price base quantity) + Sum of invoice line charge amount - sum of invoice line allowance amount
u:slack($lineExtensionAmount, ($quantity * ($priceAmount div $baseQuantity)) + $chargesTotal - $allowancesTotal, $slackValue)