Dear @gccvat12,
Thanks for reaching out.
The error BR-KSA-39 indicates that the invoice must include the seller’s VAT registration number (BT-31) or seller group VAT number as per the ZATCA XML standards attached below:
20230519_ZATCA_Electronic_Invoice_XML_Implementation_Standard_ vF.pdf
To resolve this, please ensure your XML file contains the VAT registration number in the following structure:
<ubl:Invoice>
<cac:AccountingSupplierParty>
<cac:Party>
<cac:PartyTaxScheme>
<cbc:CompanyID>YOUR_VAT_REGISTRATION_NUMBER</cbc:CompanyID>
</cac:PartyTaxScheme>
</cac:Party>
</cac:AccountingSupplierParty>
</ubl:Invoice>
After updating the XML, it is recommended to validate it in the ZATCA simulation portal before resubmitting the invoice.
Let us know if you need further support.
Best regards,