State Codes 17 should be used for Consolidated Invoice only - Buyer-/ubl:Invoice/cac:AccountingCustomerParty/cac:Party/cac:PostalAddress/cbc:CountrySubentityCode

Hi there, fixed star. The State Code 17 requirement for UBL XML is specific to consolidated invoices. Since this involves ongoing invoice validation and tax rules, it’s best to have our QuickBooks Support team review your account during their available hours to ensure the correct codes are applied and your XML is compliant.
 

To connect with our support team, click the Help (?) button in QuickBooks Online, then go to the Search tab. Enter Contact Us and choose either Callback or Chat. Follow the prompts to reach a representative who will assist you with invoice compliance.
 

If you have any other questions, feel free to reply to this thread.