[IMP] account: implement tax_base_amount on account.move.line

Stores the base amount of the tax specified by tax_line_id. Useful for auditing tax reports.

addons/account/models/account_move.py

@@ -359,6 +359,15 @@ class AccountMoveLine(models.Model):
                 move_line.credit_cash_basis = move_line.credit
             move_line.balance_cash_basis = move_line.debit_cash_basis - move_line.credit_cash_basis
 
+    @api.depends('move_id.line_ids', 'move_id.line_ids.tax_line_id', 'move_id.line_ids.debit', 'move_id.line_ids.credit')
+    def _compute_tax_base_amount(self):
+        for move_line in self:
+            if move_line.tax_line_id:
+                base_lines = move_line.move_id.line_ids.filtered(lambda line: move_line.tax_line_id in line.tax_ids)
+                move_line.tax_base_amount = abs(sum(base_lines.mapped('balance')))
+            else:
+                move_line.tax_base_amount = 0
+
     @api.one
     @api.depends('move_id.line_ids')
     def _get_counterpart(self):
@@ -392,6 +401,7 @@ class AccountMoveLine(models.Model):
         help="The residual amount on a journal item expressed in the company currency.")
     amount_residual_currency = fields.Monetary(compute='_amount_residual', string='Residual Amount in Currency', store=True,
         help="The residual amount on a journal item expressed in its currency (possibly not the company currency).")
+    tax_base_amount = fields.Monetary(string="Base Amount", compute='_compute_tax_base_amount', currency_field='company_currency_id', store=True)
     account_id = fields.Many2one('account.account', string='Account', required=True, index=True,
         ondelete="cascade", domain=[('deprecated', '=', False)], default=lambda self: self._context.get('account_id', False))
     move_id = fields.Many2one('account.move', string='Journal Entry', ondelete="cascade",

addons/account/views/account_view.xml

@@ -1213,6 +1213,29 @@
                 </tree>
             </field>
         </record>
+
+        <record id="view_move_line_tax_audit_tree" model="ir.ui.view">
+            <field name="name">account.move.line.tax.audit.tree</field>
+            <field name="model">account.move.line</field>
+            <field name="mode">primary</field>
+            <field name="inherit_id" ref="account.view_move_line_tree"/>
+            <field name="arch" type="xml">
+                <field name="full_reconcile_id" position="after">
+                    <field name="tax_line_id"/>
+                    <field name="tax_base_amount"/>
+                </field>
+                <field name="date_maturity" position="replace"/>
+            </field>
+        </record>
+
+        <act_window
+            id="action_move_line_select_tax_audit"
+            name="Journal Items"
+            context="{'search_default_account_id': [active_id]}"
+            res_model="account.move.line"
+            src_model="account.account"
+            view_id="account.view_move_line_tax_audit_tree"/>
+
         <record id="account_move_line_graph_date" model="ir.ui.view">
             <field name="name">account.move.line.graph</field>
             <field name="model">account.move.line</field>