BR-28

The Item gross price (BT-148) shall NOT be negative.

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What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Context
cac:InvoiceLine | cac:CreditNoteLine
Test
(cac:Price/cac:AllowanceCharge/cbc:BaseAmount) >= 0 or not(exists(cac:Price/cac:AllowanceCharge/cbc:BaseAmount))

Checked with EN 16931 Invoice (UBL), EN 16931 Credit Note (UBL), Croatia eRačun Invoice (UBL), Croatia eRačun Credit Note (UBL)

Context
//ram:IncludedSupplyChainTradeLineItem
Test
(ram:SpecifiedLineTradeAgreement/ram:GrossPriceProductTradePrice/ram:ChargeAmount >= 0) or not(ram:SpecifiedLineTradeAgreement/ram:GrossPriceProductTradePrice/ram:ChargeAmount)

Checked with EN 16931 Invoice (CII)