[BTOM-PRE-001] - Document root MUST be a UBL 2.1 Invoice or CreditNote in the correct namespace. Found '' in namespace ''.
BTOM-PRE-001/*[local-name() = ('Invoice','CreditNote') and namespace-uri() = ( 'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2', 'urn:oasis:names:specification:ubl:schema:xsd:CreditNote-2')]