[ADD] account_journal_general_sequence: account move entry sequence

Under some legislations, account moves must follow a single sequence. Since Odoo removed this sequence number in recent versions, this information was lost.

With this module, you can force your account moves to follow a separate sequence. The sequence is automatic when a move is posted. Includes a wizard to reorder those numbers in the sequence.

@moduon MT-676

account_journal_general_sequence/models/account_move.py

@@ -0,0 +1,56 @@
+# Copyright 2022 Moduon
+# License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html).
+import logging
+
+from odoo import api, fields, models
+
+_logger = logging.getLogger(__name__)
+
+
+class AccountMove(models.Model):
+    _inherit = "account.move"
+
+    _sql_constraints = [
+        (
+            "entry_number_unique",
+            "UNIQUE(entry_number, company_id)",
+            "Entry number must be unique per company.",
+        ),
+    ]
+
+    entry_number = fields.Char(
+        index=True,
+        readonly=True,
+        tracking=True,
+        store=True,
+        compute="_compute_entry_number",
+        help="Automatic numbering, based on journal configuration.",
+    )
+
+    @api.depends("state")
+    def _compute_entry_number(self):
+        """Assign an entry number when posting."""
+        canceled = self.filtered_domain(
+            [("state", "=", "cancel"), ("entry_number", "!=", False)]
+        )
+        canceled.entry_number = False
+        if canceled:
+            no_gap_seqs = canceled.mapped(
+                "journal_id.entry_number_sequence_id"
+            ).filtered_domain([("implementation", "=", "no_gap")])
+            if no_gap_seqs:
+                _logger.warning(
+                    "Emptied entry_number for %r after cancellation. "
+                    "This created gaps on %r.",
+                    canceled,
+                    no_gap_seqs,
+                )
+        chosen = self.filtered_domain(
+            [("state", "=", "posted"), ("entry_number", "=", False)]
+        )
+        for move in chosen.sorted(lambda one: (one.date, one.name, one.id)):
+            move.entry_number = move.journal_id.entry_number_sequence_id._next(
+                move.date
+            )
+        if chosen:
+            _logger.info("Added entry_number to %r", chosen)