{
  "id": "BR-CO-09",
  "country": "EU",
  "syntax": "ubl",
  "group": "document",
  "severity": "fatal",
  "severity_note": "fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.",
  "spec": "Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL",
  "statement": "The Seller VAT identifier (BT-31), the Seller tax representative VAT identifier (BT-63) and the Buyer VAT identifier (BT-48) shall have a prefix in accordance with ISO code ISO 3166-1 alpha-2 by which the country of issue may be identified. Nevertheless, Greece may use the prefix ‘EL’.",
  "statement_lang": "en",
  "context": "//cac:PartyTaxScheme[cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']",
  "test": "( contains( ' 1A AD AE AF AG AI AL AM AO AQ AR AS AT AU AW AX AZ BA BB BD BE BF BG BH BI BJ BL BM BN BO BQ BR BS BT BV BW BY BZ CA CC CD CF CG CH CI CK CL CM CN CO CR CU CV CW CX CY CZ DE DJ DK DM DO DZ EC EE EG EH EL ER ES ET FI FJ FK FM FO FR GA GB GD GE GF GG GH GI GL GM GN GP GQ GR GS GT GU GW GY HK HM HN HR HT HU ID IE IL IM IN IO IQ IR IS IT JE JM JO JP KE KG KH KI KM KN KP KR KW KY KZ LA LB LC LI LK LR LS LT LU LV LY MA MC MD ME MF MG MH MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ NA NC NE NF NG NI NL NO NP NR NU NZ OM PA PE PF PG PH PK PL PM PN PR PS PT PW PY QA RE RO RS RU RW SA SB SC SD SE SG SH SI SJ SK SL SM SN SO SR SS ST SV SX SY SZ TC TD TF TG TH TJ TK TL TM TN TO TR TT TV TW TZ UA UG UM US UY UZ VA VC VE VG VI VN VU WF WS XI YE YT ZA ZM ZW ',substring(cbc:CompanyID,1,2) ) )",
  "meaning": "The seller VAT identifier (BT-31), the seller tax representative VAT identifier (BT-63), and the buyer VAT identifier (BT-48) shall have an ISO 3166-1 alpha-2 prefix, and Greece may use the prefix ‘EL’. The statement writes ISO code ISO 3166-1, ends with a period, and quotes EL with U+2018 and U+2019. The context is any party tax scheme whose id is VAT, written cbc:ID))='VAT' with no space before =. The test takes the first two characters of the company id. It keeps a missing space after each of three commas: before substring, and inside substring(cbc:CompanyID,1,2). A single space sits after contains( and before each of two closing parentheses. The list includes EL, GR, XI, and 1A. The test does not call exists.",
  "fix": "Start BT-31, BT-63, and BT-48 with an ISO 3166-1 alpha-2 prefix from the published list. Greece may use EL.",
  "example_fail": "A VAT company identifier starts with XX.",
  "example_pass": "A VAT company identifier starts with DE, or it starts with EL.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-CO-09/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}