Message

Invoice line amount MUST be equal to the price amount multiplied by the quantity plus charges minus allowances at line level.

Context
cac:InvoiceLine
Test
$quiet or u:slack($lineExtensionAmount, u:twodec(u:twodec($pricePerUnit * $quantity) + u:twodec($sumCharge) - u:twodec($sumAllowance)), 0.02)
Usage
/ ubl:Invoice / cac:InvoiceLine / cbc:LineExtensionAmount