python-stdnum branch master updated. 2.1-11-g7ca9b6c

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https://arthurdejong.org/git/python-stdnum/commit/?id=7ca9b6ce7b1f2b4d1bf164c2af83a8a77bc919d2

commit 7ca9b6ce7b1f2b4d1bf164c2af83a8a77bc919d2
Author: Arthur de Jong <arthur@arthurdejong.org>
Date:   Sun Oct 26 12:44:39 2025 +0100

    Validate first digit of Belgian VAT number
    
    Thanks to antonio-ginestar find pointing this out.
    
    Closes https://github.com/arthurdejong/python-stdnum/issues/488

diff --git a/stdnum/be/vat.py b/stdnum/be/vat.py
index d4c235b..982d5ae 100644
--- a/stdnum/be/vat.py
+++ b/stdnum/be/vat.py
@@ -1,6 +1,6 @@
 # vat.py - functions for handling Belgian VAT numbers
 #
-# Copyright (C) 2012-2016 Arthur de Jong
+# Copyright (C) 2012-2025 Arthur de Jong
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -67,6 +67,8 @@ def validate(number: str) -> str:
         raise InvalidFormat()
     if len(number) != 10:
         raise InvalidLength()
+    if not number[0] in '01':
+        raise InvalidComponent()
     if checksum(number) != 0:
         raise InvalidChecksum()
     return number
diff --git a/tests/test_be_vat.doctest b/tests/test_be_vat.doctest
index 5d68441..8f01a3a 100644
--- a/tests/test_be_vat.doctest
+++ b/tests/test_be_vat.doctest
@@ -1,6 +1,6 @@
 test_be_vat.doctest - more detailed doctests for stdnum.be.vat module
 
-Copyright (C) 2020 Arthur de Jong
+Copyright (C) 2020-2025 Arthur de Jong
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
@@ -31,7 +31,15 @@ Tests for corner cases.
 Traceback (most recent call last):
     ...
 InvalidFormat: ...
+>>> vat.validate('BE000000000')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
 >>> vat.validate('000000')
 Traceback (most recent call last):
     ...
 InvalidFormat: ...
+>>> vat.validate('BE2000021323')
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...

-----------------------------------------------------------------------

Summary of changes:
 stdnum/be/vat.py          |  4 +++-
 tests/test_be_vat.doctest | 10 +++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)


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