[IMP] point_of_sale: Mapping accounts

accounts mapping of fiscal positions should work on the PoS as it works
in Sales

Description of the issue/feature this PR addresses:

Setup a fiscal position with account mapping for income account and
receivable account
Make a pos_order with the fiscal position

Current behavior before PR:

When pos is closed, account mapping is not done and the
account_move does not take the mapped income account nor
receivable account

Desired behavior after PR is merged:

The account_move should take the mapped income account
and receivable account

task:
https://www.odoo.com/web#id=1916865&action=333&active_id=1428&model=project.task&view_type=form&menu_id=4720

closes odoo/odoo#29433

addons/point_of_sale/models/pos_order.py

@@ -276,8 +276,9 @@ class PosOrder(models.Model):
             raise UserError(_('Please define income '
                               'account for this product: "%s" (id:%d).')
                             % (line.product_id.name, line.product_id.id))
-        if order.fiscal_position_id.account_ids:
-            income_account = order.fiscal_position_id.map_account(income_account)
+        fpos = order.fiscal_position_id or order.partner_id.property_account_position_id
+        if fpos:
+            income_account = fpos.map_account(income_account)
 
         name = line.product_id.name
         if line.notice:
@@ -385,7 +386,12 @@ class PosOrder(models.Model):
             current_company = order.sale_journal.company_id
             account_def = IrProperty.get(
                 'property_account_receivable_id', 'res.partner')
-            order_account = order.partner_id.property_account_receivable_id.id or account_def and account_def.id
+            order_account = order.partner_id.property_account_receivable_id or account_def
+            # If fiscal position, then map order account
+            fpos = order.fiscal_position_id or order.partner_id.property_account_position_id
+            if fpos:
+                order_account = fpos.map_account(order_account)
+
             partner_id = ResPartner._find_accounting_partner(order.partner_id).id or False
             if not move:
                 # Create an entry for the sale
@@ -462,7 +468,7 @@ class PosOrder(models.Model):
                 amount_total = order.amount_total
             data = {
                 'name': _("Trade Receivables"),  # order.name,
-                'account_id': order_account,
+                'account_id': order_account.id,
                 'credit': ((amount_total < 0) and -amount_total) or 0.0,
                 'debit': ((amount_total > 0) and amount_total) or 0.0,
                 'partner_id': partner_id

addons/point_of_sale/static/src/js/screens.js

@@ -2170,7 +2170,7 @@ var set_fiscal_position_button = ActionButtonWidget.extend({
 
         var selection_list = no_fiscal_position.concat(fiscal_positions);
         self.gui.show_popup('selection',{
-            title: _t('Select tax'),
+            title: _t('Select Fiscal Position'),
             list: selection_list,
             confirm: function (fiscal_position) {
                 var order = self.pos.get_order();

addons/point_of_sale/views/pos_config_view.xml

@@ -207,14 +207,14 @@
                     </div>
                     <h2>Taxes</h2>
                     <div class="row mt16 o_settings_container">
-                        <div class="col-12 col-lg-6 o_setting_box" title="Choose a specific tax regime at the order depending on the kind of customer (tax exempt, onsite vs. takeaway, etc.).">
+                        <div class="col-12 col-lg-6 o_setting_box" title="Choose a specific fiscal position at the order depending on the kind of customer (tax exempt, onsite vs. takeaway, etc.).">
                             <div class="o_setting_left_pane">
                                 <field name="tax_regime_selection"/>
                             </div>
                             <div class="o_setting_right_pane">
                                 <label for="tax_regime_selection" string="Fiscal Position per Order"/>
                                 <div class="text-muted">
-                                    Choose among several tax regimes when processing an order
+                                    Choose among fiscal positions when processing an order
                                 </div>
                                 <div class="content-group" attrs="{'invisible': [('tax_regime_selection', '=', False)]}">
                                     <div class="mt16">