Add Belgian structured communication (OGM/VCS) invoice reference type

account_invoice_structured_ref_be/models/__init__.py

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+# -*- coding: utf-8 -*-
+from . import account_journal
+from . import account_move

account_invoice_structured_ref_be/models/account_journal.py

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+# -*- coding: utf-8 -*-
+from odoo import fields, models
+
+
+class AccountJournal(models.Model):
+    _inherit = 'account.journal'
+
+    invoice_reference_type = fields.Selection(
+        selection_add=[('be_structured', 'Based on Invoice Number (BE Structured)')],
+        ondelete={'be_structured': 'set default'},
+    )

account_invoice_structured_ref_be/models/account_move.py

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+# -*- coding: utf-8 -*-
+import re
+from odoo import models
+
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    def _get_invoice_reference_be_structured(self):
+        """Compute a Belgian structured communication (OGM/VCS) from the invoice name.
+
+        1. Strip all non-digit characters from the invoice name.
+        2. Zero-pad left to 10 digits.
+        3. Check digits = (number % 97) or 97 if result is 0, zero-padded to 2 digits.
+        4. Format: +++XXX/XXXX/XXXCC+++ (positions 0-2, 3-6, 7-9, then 2-digit check).
+        """
+        self.ensure_one()
+        digits = re.sub(r'\D', '', self.name or '').zfill(10)
+        check = int(digits) % 97 or 97
+        cc = str(check).zfill(2)
+        return '+++{}/{}/{}{}+++'.format(digits[0:3], digits[3:7], digits[7:10], cc)
+
+    def _get_invoice_computed_reference(self):
+        self.ensure_one()
+        if self.journal_id.invoice_reference_type == 'be_structured':
+            return self._get_invoice_reference_be_structured()
+        return super()._get_invoice_computed_reference()