[IMP] account_payment_return: Make line date editable

When entering manually returns, you need to change the line date.

This commit also allows to use header date as defaut line date.

account_payment_return/models/payment_return.py

@@ -220,10 +220,7 @@ class PaymentReturnLine(models.Model):
         help="Reference to match moves from related documents")
     move_line_ids = fields.Many2many(
         comodel_name='account.move.line', string='Payment Reference')
-    date = fields.Date(
-        string='Return date', readonly=True,
-        help="Read from imported file. Only for reference.",
-        default=lambda x: fields.Date.today())
+    date = fields.Date(string='Return date')
     partner_name = fields.Char(
         string='Partner name', readonly=True,
         help="Read from imported file. Only for reference.")

account_payment_return/views/payment_return_view.xml

@@ -6,7 +6,7 @@
             <field name="model">payment.return</field>
             <field name="type">form</field>
             <field name="arch" type="xml">
-                <form string="Payment return" version="7.0">
+                <form string="Payment return">
                     <header>
                         <button name="action_confirm" string="Confirm" type="object" states="draft,imported" class="oe_highlight" />
                         <button name="button_match" string="Match" type="object" states="draft,imported" class="oe_highlight" />
@@ -24,7 +24,7 @@
 	                    </group>
 	                    <notebook colspan="4">
 	                        <page string="Lines">
-	                            <field name="line_ids" colspan="4" nolabel="1" widget="one2many_list">
+	                            <field name="line_ids" colspan="4" nolabel="1" widget="one2many_list" context="{'default_date': date}">
 	                                <tree string="Payment return lines" editable="top">
 	                                    <field name="date" />
 	                                    <field name="concept" />