It must be possible to modify the period or the accounting date on an invoice

or an accounting document.
Updated the translations.

i18n/fr.po

@@ -6,8 +6,8 @@
 msgstr ""
 "Project-Id-Version: Odoo Server 10.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-04-23 15:46+0000\n"
-"PO-Revision-Date: 2020-04-23 17:47+0200\n"
+"POT-Creation-Date: 2021-02-18 09:44+0000\n"
+"PO-Revision-Date: 2021-02-18 10:45+0100\n"
 "Last-Translator: Houzéfa Abbasbhay <houzefa.abba@xcg-consulting.fr>\n"
 "Language-Team: XCG Consulting\n"
 "Language: fr\n"
@@ -15,7 +15,7 @@
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
-"X-Generator: Poedit 2.0.6\n"
+"X-Generator: Poedit 2.3\n"
 
 #. module: account_period
 #: model:ir.model,name:account_period.model_account_chart_template
@@ -307,6 +307,24 @@
 msgstr "Date de fin"
 
 #. module: account_period
+#: code:addons/account_period/models/account_move.py:0
+#, python-format
+msgid ""
+"The accounting date must be anterior to the validation date or the same."
+msgstr ""
+"La date de comptabilisation doit correspondre à la date de validation ou lui "
+"être antérieure."
+
+#. module: account_period
+#: code:addons/account_period/models/account_move.py:0
+#, python-format
+msgid ""
+"The accounting period must match the validation date or be anterior to it."
+msgstr ""
+"La période comptable doit correspondre à la date de validation ou lui être "
+"antérieure."
+
+#. module: account_period
 #: model:ir.model.constraint,message:account_period.constraint_account_fiscalyear_unique_code_per_company
 #: model:ir.model.constraint,message:account_period.constraint_account_period_unique_code_per_company
 msgid "The code must be unique."

models/account_move.py

@@ -33,7 +33,9 @@
         string="Accounting date",
         copy=False,
         help="Validation date of the accounting document.",
-        readonly=True,
+        states={"posted": [("readonly", True), ("required", True)]},
+        required=False,
+        readonly=False,
     )
 
     period_id = fields.Many2one(
@@ -42,6 +44,8 @@
         ondelete="restrict",
         help="The period this accounting document is in.",
         states={"posted": [("readonly", True), ("required", True)]},
+        required=False,
+        readonly=False,
     )
 
     transaction_date = fields.Date(
@@ -71,7 +75,8 @@
         period.
         """
 
+        self.check_accounting_date_integrity()
         self.fill_accounting_dates()
 
         return super(AccountMove, self).post()
 
@@ -74,7 +79,43 @@
         self.fill_accounting_dates()
 
         return super(AccountMove, self).post()
 
+    def check_accounting_date_integrity(self):
+
+        if any(
+            self.mapped(
+                lambda r: (
+                    r.accounting_date > fields.Date.today()
+                    if r.accounting_date
+                    else False
+                )
+            )
+        ):
+
+            raise exceptions.ValidationError(
+                _(
+                    "The accounting date must be anterior to the validation "
+                    "date or the same."
+                )
+            )
+
+        return True
+
+    def check_period_integrity(self):
+
+        if any(
+            self.mapped(lambda r: r.period_id.date_start > fields.Date.today())
+        ):
+
+            raise exceptions.ValidationError(
+                _(
+                    "The accounting period must match the validation "
+                    "date or be anterior to it."
+                )
+            )
+
+        return True
+
     def fill_accounting_dates(self):
         """- Set the accounting date.
         - Also set the transaction date ("transaction_date" field) when empty.
@@ -82,7 +123,7 @@
         - Only select open periods.
         """
 
-        acc_date = datetime.date.today()
+        today = datetime.date.today()
 
         for accdoc in self:
 
@@ -86,6 +127,8 @@
 
         for accdoc in self:
 
+            acc_date = accdoc.accounting_date or today
+
             # Cache some data.
             company = accdoc.company_id
 
@@ -95,18 +138,15 @@
                 # If accounting document date is empty, get today date.
                 acc_date = accdoc.date or acc_date
 
-            # Periods are ordered by date so selecting the first one is fine.
-            period = self.env["account.period"].search(
-                [
-                    ("company_id", "=", company.id),
-                    ("date_start", "<=", acc_date),
-                    ("date_effective_cutoff", ">=", acc_date),
-                    ("state", "!=", "done"),
-                ],
-                limit=1,
-            )
-            if not period:
-                raise exceptions.Warning(
-                    _('No period found around %s in the "%s" company.')
-                    % (acc_date, company.sudo().name)
+            if not accdoc.period_id:
+                # Periods are ordered by date so selecting the first one is
+                # fine.
+                period = self.env["account.period"].search(
+                    [
+                        ("company_id", "=", company.id),
+                        ("date_start", "<=", acc_date),
+                        ("date_effective_cutoff", ">=", acc_date),
+                        ("state", "!=", "done"),
+                    ],
+                    limit=1,
                 )
@@ -112,4 +152,15 @@
                 )
+                if not period:
+                    raise exceptions.Warning(
+                        _('No period found around %s in the "%s" company.')
+                        % (acc_date, company.sudo().name)
+                    )
+
+                accdoc_values = {"period_id": period.id}
+            else:
+                accdoc.check_period_integrity()
+                period = accdoc.period_id
+                accdoc_values = {}
 
             # When we are between the period end and cut-off date, force the
             # last day of the period.
@@ -120,10 +171,7 @@
                 acc_date = period_end if in_cutoff else acc_date
 
             # The data to update the accounting document with.
-            accdoc_values = {
-                "accounting_date": acc_date,
-                "period_id": period.id,
-            }
+            accdoc_values.update({"accounting_date": acc_date})
 
             # Set a transaction date when no previous one set. Also, force it
             # during cut-off.

views/account_move.xml

@@ -12,7 +12,7 @@
 
             <!-- Add fields. -->
             <xpath expr="//field[@name='date']" position="before">
-                <field name="period_id" options="{'no_create': 1}" states="posted" />
+                <field name="period_id" options="{'no_create': 1}" />
             </xpath>
             <xpath expr="//field[@name='date']" position="after">
                 <field name="accounting_date" />
@@ -16,7 +16,8 @@
             </xpath>
             <xpath expr="//field[@name='date']" position="after">
                 <field name="accounting_date" />
-                <field name="transaction_date" />
+                <field name="transaction_date" 
+                    attrs="{'invisible': [('type', '!=', 'entry')]}" />
             </xpath>
 
         </field>