[ADD] account_custom_duty: manage custom duties on import & export transactions

account_custom_duty/__init__.py

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+from . import models
+from . import wizard

account_custom_duty/__manifest__.py

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+{
+    "name": "Custom Duty on Import Export",
+    "summary": "Manage custom duty on import & export transactions.",
+    "description": "Provide functionality to calculate custom duties on import and export transactions in the accounting module.",
+    "category": "Accounting",
+    "version": "1.0",
+    "depends": ["accountant", "l10n_in"],  
+    "data": [
+        "security/ir.model.access.csv",
+        "views/res_config_settings_views.xml",
+        "wizard/bill_entry_wizard_view.xml",
+        "views/account_move_views.xml",
+    ],
+    "installable": True,
+    "license": "LGPL-3",
+}

account_custom_duty/models/__init__.py

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+from . import res_company
+from . import res_config_settings
+from . import account_move
+

account_custom_duty/models/account_move.py

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+from odoo import _, fields, models
+from odoo.exceptions import UserError
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    #trace which invoice generated the custom duty journal entry.
+    custom_duty_journal_entry_id = fields.Many2one('account.move', string='Journal Entry of Custom Duty', readonly=True) 
+
+    def action_open_bill_of_entry_wizard(self):
+        self.ensure_one()
+        if self.state != 'posted' or self.l10n_in_gst_treatment not in ['overseas', 'special_economic_zone', 'deemed_export']:
+            raise UserError('Action can only be performed on posted moves with GST treatment like overseas, special economic zone, or deemed export .')
+        return {
+            'name': 'Bill of Entry',
+            'type': 'ir.actions.act_window',
+            'view_mode': 'form',
+            'res_model': 'bill.entry.wizard',
+            'view_id': self.env.ref('account_custom_duty.bill_entry_wizard_view_form').id,
+            'target': 'new',
+            'context': {
+                'move_id': self.id 
+            },
+        }

account_custom_duty/models/res_company.py

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+from odoo import fields, models
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    is_import_export = fields.Boolean(string="Enable Import-Export Settings", store=True)
+    account_import_journal_id = fields.Many2one('account.journal', string="Default Import Journal")
+    account_import_custom_duty_account_id = fields.Many2one('account.account', string="Default Import Custom Duty Account")
+    account_import_tax_account_id = fields.Many2one('account.account', string="Default Import Tax Account")
+    account_export_journal_id = fields.Many2one('account.journal', string="Default Export Journal")
+    account_export_custom_duty_account_id = fields.Many2one('account.account', string="Default Export Custom Duty Account")
+    account_export_tax_account_id = fields.Many2one('account.account', string="Default Export Tax Account")

account_custom_duty/models/res_config_settings.py

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+from odoo import fields, models
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    is_import_export = fields.Boolean(string="Enable Import-Export Settings", company_dependent=True, store=True)
+    account_import_journal_id = fields.Many2one(
+        'account.journal',
+        string="Default Import Journal",
+        related='company_id.account_import_journal_id',
+        readonly=False
+    )
+    account_import_custom_duty_account_id = fields.Many2one(
+        'account.account',
+        string="Default Import Custom Duty Account",
+        related='company_id.account_import_custom_duty_account_id',
+        readonly=False
+    )
+    account_import_tax_account_id = fields.Many2one(
+        'account.account',
+        string="Default Import Tax Account",
+        related='company_id.account_import_tax_account_id',
+        readonly=False
+    )
+    account_export_journal_id = fields.Many2one(
+        'account.journal',
+        string="Default Export Journal",
+        related='company_id.account_export_journal_id',
+        readonly=False
+    )
+    account_export_custom_duty_account_id = fields.Many2one(
+        'account.account',
+        string="Default Export Custom Duty Account",
+        related='company_id.account_export_custom_duty_account_id',
+        readonly=False
+    )
+    account_export_tax_account_id = fields.Many2one(
+        'account.account',
+        string="Default Export Tax Account",
+        related='company_id.account_export_tax_account_id',
+        readonly=False
+    )

account_custom_duty/security/ir.model.access.csv

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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_bill_entry_wizard,access_bill_entry_wizard,model_bill_entry_wizard,account.group_account_user,1,1,1,1
+access_bill_entry_details_wizard,access_bill_entry_details_wizard,model_bill_entry_details_wizard,account.group_account_user,1,1,1,1

account_custom_duty/views/account_move_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="account_custom_duty_view_move_form" model="ir.ui.view">
+        <field name="name">account.custom.duty.view.move.form</field>
+        <field name="model">account.move</field>
+        <field name="inherit_id" ref="account.view_move_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//form//button[@name='button_draft']" position="after">
+                <button name="action_open_bill_of_entry_wizard"
+                    type="object"
+                    class="oe_highlight"
+                    string="Bill of Entry"
+                    invisible="state != 'posted' or l10n_in_gst_treatment not in ['overseas','special_economic_zone','deemed_export'] or move_type != 'in_invoice'"
+                    icon="fa-download"
+                />
+            </xpath>
+            <xpath expr="//form/sheet/div[@name='button_box']/button" position="after">
+                <button type="action" class="oe_stat_button"
+                    invisible="not custom_duty_journal_entry_id"
+                    name="account.action_move_journal_line"
+                    context="{'search_default_ref' : name}"
+                    icon="fa-book">
+                    <span name='journal_entries' widget='statinfo'>Journal Entry</span>
+                </button>
+            </xpath>
+        </field>
+    </record>
+</odoo>

account_custom_duty/views/res_config_settings_views.xml

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+<odoo>
+    <record id="res_config_settings_view_form" model="ir.ui.view">
+        <field name="name">res.config.settings.view.form.inherit.account.import.export.duty</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="account.res_config_settings_view_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//block[@id='india_localization']" position="inside">
+
+              <setting name="enable_import_export"
+                         string="Import-Export Settings"
+                         invisible="country_code != 'IN'"
+                         help="Enable this to feature to apply custom duty on import/export transactions, including Bill of Entry and Shipping Bills."
+                         company_dependent="1">
+                    <field name="is_import_export" class="oe_inline" widget="checkbox" string="Import-Export"/>
+                </setting>
+
+                <setting string="Import" invisible="not is_import_export">
+                    <div class="content-group">
+                        <div class="row mt8">
+                            <label for="account_import_journal_id" class="col-lg-5 o_light_label"
+                                string="Journal" />
+                            <field name="account_import_journal_id"
+                                domain="[('type', '=', 'general'), ('active', '=', True)]"
+                            />
+                        </div>
+                        <div class="row mt8">
+                            <label for="account_import_custom_duty_account_id"
+                                class="col-lg-5 o_light_label"
+                                string="Custom Duty Account" />
+                            <field name="account_import_custom_duty_account_id"
+                                domain="[('account_type', 'like', 'expense'), ('deprecated', '=', False)]"
+                            />
+                        </div>
+                        <div class="row mt8">
+                            <label for="account_import_tax_account_id"
+                                class="col-lg-5 o_light_label"
+                                string="Default Tax Account" />
+                            <field name="account_import_tax_account_id"
+                                domain="[
+                                    '|', 
+                                    ('account_type', 'like', 'asset'), 
+                                    ('account_type', 'like', 'liability'), 
+                                    ('reconcile', '=', True), 
+                                    ('deprecated', '=', False)
+                                ]"
+                            />
+                        </div>
+                    </div>
+                </setting>
+                <setting string="Export" invisible="not is_import_export">
+                    <div class="content-group">
+                        <div class="row mt8">
+                            <label for="account_export_journal_id" class="col-lg-5 o_light_label"
+                                string="Journal" />
+                            <field name="account_export_journal_id"
+                                domain="[('type', '=', 'general'), ('active', '=', True)]"
+                            />
+                        </div>
+                        <div class="row mt8">
+                            <label for="account_export_custom_duty_account_id"
+                                class="col-lg-5 o_light_label"
+                                string="Custom Duty Account" />
+                            <field name="account_export_custom_duty_account_id"
+                                domain="[
+                                    '|',
+                                    ('account_type', 'like', 'income'), 
+                                    ('account_type', 'like', 'expense'), 
+                                    ('deprecated', '=', False)
+                                ]"
+                            />
+                        </div>
+                        <div class="row mt8">
+                            <label for="account_export_tax_account_id"
+                                class="col-lg-5 o_light_label"
+                                string="Default Tax Account" />
+                            <field name="account_export_tax_account_id"
+                                domain="[
+                                    '|', 
+                                    ('account_type', 'like', 'asset'), 
+                                    ('account_type', 'like', 'liability'), 
+                                    ('reconcile', '=', True), 
+                                    ('deprecated', '=', False)
+                                ]"
+                            />
+                        </div>
+                    </div>
+                </setting>
+            </xpath>
+        </field>
+    </record>
+</odoo>

account_custom_duty/wizard/__init__.py

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+from . import bill_entry_wizard
+from . import bill_entry_details_wizard

account_custom_duty/wizard/bill_entry_details_wizard.py

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+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class BillEntryDetailsWizard(models.TransientModel):
+    _name = 'bill.entry.details.wizard'
+    _description = 'Bill Entry Details Wizard'
+
+    currency_id = fields.Many2one('res.currency', string='Currency', default=lambda self: self.env.company.currency_id)
+    wizard_id = fields.Many2one('bill.entry.wizard', string="Wizard Reference", ondelete='cascade')
+    move_line_id = fields.Many2one('account.move.line', string='Move Line', required=True)
+
+    product_id = fields.Many2one('product.product', string='Product', related='move_line_id.product_id')
+    quantity = fields.Float(string='Quantity', related='move_line_id.quantity')
+    price_unit = fields.Float(string='Unit Price', related='move_line_id.price_unit')
+
+    custom_currency_rate = fields.Monetary(string='Custom Currency Rate', currency_field='currency_id', related='wizard_id.custom_currency_rate')
+
+    custom_duty = fields.Monetary(string='Custom Duty & Additional Charges', currency_field='currency_id', default=0.0)
+    tax_ids = fields.Many2many('account.tax', string='Taxes', domain=[('type_tax_use', '=', 'purchase')])
+
+    assessable_value = fields.Monetary(string='Assessable Value', currency_field='currency_id', compute='_compute_assessable_value', default=0.0)
+    taxable_amount = fields.Monetary(string='Taxable Amount', currency_field='currency_id', compute='_compute_taxable_amount', default=0.0)
+    tax_amount = fields.Monetary(string='Tax Amount', currency_field='currency_id', compute='_compute_tax_amount', default=0.0)
+
+    @api.constrains('custom_duty')
+    def _check_positive_custom_duty(self):
+        for record in self:
+            if record.custom_duty < 0:
+                raise ValidationError("Custom Duty cannot be a negative amount.")
+
+    @api.depends('quantity', 'price_unit', 'wizard_id.custom_currency_rate')
+    def _compute_assessable_value(self):
+        for record in self:
+            record.assessable_value = (record.quantity * record.price_unit * record.wizard_id.custom_currency_rate)
+
+    @api.depends('assessable_value', 'custom_duty')
+    def _compute_taxable_amount(self):
+        for record in self:
+            record.taxable_amount = record.assessable_value + record.custom_duty
+
+    @api.depends('taxable_amount', 'tax_ids')
+    def _compute_tax_amount(self):
+        for record in self:
+            tax_factor = sum(record.tax_ids.mapped('amount')) / 100 if record.tax_ids else 0.0
+            record.tax_amount = record.taxable_amount * tax_factor