[FIX] account: Date maturity in duplicate journal entry.

Before this commit, when the journal entry date was duplicated, the
maturity date (in the journal entry lines) stayed unchanged (it kept the
values of the original journal) and the user wasn't able to modify it.

Now, when the user duplicated a journal entry, the user can modify the
maturity date.

Note that, as is the case for the journal entry date, the maturity date
can't be modified after saving the journal entry.

OPW-1914706

closes odoo/odoo#30393

addons/account/models/account_move.py

@@ -272,6 +272,17 @@ class AccountMove(models.Model):
     def open_reconcile_view(self):
         return self.line_ids.open_reconcile_view()
 
+    # FIXME: Clarify me and change me in master
+    @api.multi
+    def action_duplicate(self):
+        self.ensure_one()
+        action = self.env.ref('account.action_move_journal_line').read()[0]
+        action['target'] = 'inline'
+        action['context'] = dict(self.env.context)
+        action['context']['view_no_maturity'] = False
+        action['views'] = [(self.env.ref('account.view_move_form').id, 'form')]
+        action['res_id'] = self.copy().id
+        return action
 
 class AccountMoveLine(models.Model):
     _name = "account.move.line"
@@ -436,7 +447,7 @@ class AccountMoveLine(models.Model):
         index=True, store=True, copy=False)  # related is required
     blocked = fields.Boolean(string='No Follow-up', default=False,
         help="You can check this box to mark this journal item as a litigation with the associated partner")
-    date_maturity = fields.Date(string='Due date', index=True, required=True,
+    date_maturity = fields.Date(string='Due date', index=True, required=True, copy=False,
         help="This field is used for payable and receivable journal entries. You can put the limit date for the payment of this line.")
     date = fields.Date(related='move_id.date', string='Date', index=True, store=True, copy=False)  # related is required
     analytic_line_ids = fields.One2many('account.analytic.line', 'move_id', string='Analytic lines', oldname="analytic_lines")

addons/account/views/account_view.xml

@@ -1427,10 +1427,11 @@
             <field name="name">account.move.form</field>
             <field name="model">account.move</field>
             <field name="arch" type="xml">
-                <form string="Account Entry">
+                <form string="Account Entry" duplicate="false">
                     <header>
                         <button name="post" states="draft" string="Post" type="object" class="oe_highlight" groups="account.group_account_invoice"/>
                         <button name="%(action_view_account_move_reversal)d" states="posted" string="Reverse Entry" type="action" groups="account.group_account_invoice"/>
+                        <button name="action_duplicate" string="Duplicate" type="object" groups="account.group_account_invoice"/>
                         <field name="state" widget="statusbar"/>
                     </header>
                     <sheet>