# BR-KSA-EN16931-07

Source: https://xmlvalid.com/rules/BR-KSA-EN16931-07

> Item net price (BT-146) must equal (Item Gross price (BT-148) - Allowance amount (BT-147)) when gross price is provided.

- Level: error
- Rule sets: ZATCA e-invoicing rules (Saudi Arabia) SDK 3.4.6
- Context: `cac:InvoiceLine/cac:Price/cac:AllowanceCharge/cbc:BaseAmount`
- Test: `xs:decimal(../../cbc:PriceAmount) = xs:decimal(.) - xs:decimal(../cbc:Amount)`

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