# BR-KSA-29

Source: https://xmlvalid.com/rules/BR-KSA-29

> If the cryptographic stamp (KSA-15) exists in the invoice, this cryptographic stamp (KSA-15) must contain the exact "urn:oasis:names:specification:ubl:signature:Invoice" value for referenced signature ID and signature ID.

- Level: warning
- Rule sets: ZATCA e-invoicing rules (Saudi Arabia) SDK 3.4.6
- Context: `cac:AdditionalDocumentReference/cac:Attachment`
- Test: `exists(cbc:EmbeddedDocumentBinaryObject) and (cbc:EmbeddedDocumentBinaryObject) != '' and (//cac:Signature/cbc:ID) = 'urn:oasis:names:specification:ubl:signature:Invoice'`

Validate a document against these rules: https://xmlvalid.com/validate