diff --git a/fusion-plating/fusion_plating_invoicing/models/account_move.py b/fusion-plating/fusion_plating_invoicing/models/account_move.py
index 0c8fe912..e3624563 100644
--- a/fusion-plating/fusion_plating_invoicing/models/account_move.py
+++ b/fusion-plating/fusion_plating_invoicing/models/account_move.py
@@ -2,4 +2,27 @@
 # Copyright 2026 Nexa Systems Inc.
 # License OPL-1 (Odoo Proprietary License v1.0)
 # Part of the Fusion Plating product family.
-# Placeholder — implemented in a later task.
+
+from odoo import models, _
+from odoo.exceptions import UserError
+
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    def action_post(self):
+        """Check account hold before posting invoices."""
+        for move in self:
+            if move.move_type in ('out_invoice', 'out_refund') and move.partner_id:
+                if move.partner_id.x_fc_account_hold:
+                    is_manager = self.env.user.has_group(
+                        'fusion_plating.group_fusion_plating_manager'
+                    )
+                    if not is_manager:
+                        raise UserError(_(
+                            'Cannot post invoice — customer "%s" is on account hold.\n'
+                            'Reason: %s\n\n'
+                            'Contact a manager to override.'
+                        ) % (move.partner_id.name,
+                             move.partner_id.x_fc_account_hold_reason or 'No reason specified'))
+        return super().action_post()
diff --git a/fusion-plating/fusion_plating_invoicing/models/sale_order.py b/fusion-plating/fusion_plating_invoicing/models/sale_order.py
index 0c8fe912..dcd52878 100644
--- a/fusion-plating/fusion_plating_invoicing/models/sale_order.py
+++ b/fusion-plating/fusion_plating_invoicing/models/sale_order.py
@@ -2,4 +2,105 @@
 # Copyright 2026 Nexa Systems Inc.
 # License OPL-1 (Odoo Proprietary License v1.0)
 # Part of the Fusion Plating product family.
-# Placeholder — implemented in a later task.
+
+import logging
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+
+_logger = logging.getLogger(__name__)
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    @api.onchange('partner_id')
+    def _onchange_partner_id_invoice_strategy(self):
+        """Auto-fill invoice strategy from customer defaults."""
+        if self.partner_id:
+            default = self.env['fp.invoice.strategy.default'].search(
+                [('partner_id', '=', self.partner_id.id)], limit=1,
+            )
+            if default:
+                self.x_fc_invoice_strategy = default.default_strategy
+                self.x_fc_deposit_percent = default.default_deposit_percent
+                if default.payment_term_id:
+                    self.payment_term_id = default.payment_term_id
+
+    def action_confirm(self):
+        """Override to check account hold and trigger invoice strategy."""
+        for order in self:
+            # --- Account hold check ---
+            if order.partner_id.x_fc_account_hold:
+                is_manager = self.env.user.has_group(
+                    'fusion_plating.group_fusion_plating_manager'
+                )
+                if not is_manager:
+                    raise UserError(_(
+                        'Cannot confirm — customer "%s" is on account hold.\n'
+                        'Reason: %s\n\n'
+                        'Contact a manager to override.'
+                    ) % (order.partner_id.name,
+                         order.partner_id.x_fc_account_hold_reason or 'No reason specified'))
+                else:
+                    # Manager gets a warning in chatter but can proceed
+                    order.message_post(
+                        body=_(
+                            'Warning: Customer "%s" is on account hold (reason: %s). '
+                            'Order confirmed by manager override.'
+                        ) % (order.partner_id.name,
+                             order.partner_id.x_fc_account_hold_reason or 'N/A'),
+                    )
+
+        res = super().action_confirm()
+
+        # --- Invoice strategy automation ---
+        for order in self:
+            strategy = order.x_fc_invoice_strategy
+            if not strategy:
+                continue
+
+            if strategy == 'deposit' and order.x_fc_deposit_percent:
+                order._create_deposit_invoice()
+            elif strategy == 'cod_prepay':
+                order._create_full_invoice()
+
+        return res
+
+    def _create_deposit_invoice(self):
+        """Create a deposit (down payment) invoice for the deposit percentage."""
+        self.ensure_one()
+        percent = self.x_fc_deposit_percent
+        if not percent or percent <= 0:
+            return
+
+        try:
+            # Use Odoo's standard down payment mechanism
+            wizard = self.env['sale.advance.payment.inv'].create({
+                'advance_payment_method': 'percentage',
+                'amount': percent,
+            })
+            wizard.with_context(active_ids=self.ids, active_model='sale.order').create_invoices()
+            self.message_post(
+                body=_('Deposit invoice (%.0f%%) created automatically — strategy: Deposit.') % percent,
+            )
+        except Exception as e:
+            _logger.warning('Failed to create deposit invoice for SO %s: %s', self.name, e)
+            self.message_post(
+                body=_('Failed to auto-create deposit invoice: %s. Create manually.') % str(e),
+            )
+
+    def _create_full_invoice(self):
+        """Create a full invoice immediately (COD/Prepay strategy)."""
+        self.ensure_one()
+        try:
+            invoices = self._create_invoices()
+            if invoices:
+                self.message_post(
+                    body=_('Full invoice created automatically — strategy: COD / Prepay.'),
+                )
+        except Exception as e:
+            _logger.warning('Failed to create COD invoice for SO %s: %s', self.name, e)
+            self.message_post(
+                body=_('Failed to auto-create invoice: %s. Create manually.') % str(e),
+            )
diff --git a/fusion-plating/fusion_plating_invoicing/views/fp_invoicing_menu.xml b/fusion-plating/fusion_plating_invoicing/views/fp_invoicing_menu.xml
index 3859f8d4..801c0211 100644
--- a/fusion-plating/fusion_plating_invoicing/views/fp_invoicing_menu.xml
+++ b/fusion-plating/fusion_plating_invoicing/views/fp_invoicing_menu.xml
@@ -5,4 +5,33 @@
     Part of the Fusion Plating product family.
 -->
 <odoo>
+
+    <!-- ===== Window actions (BEFORE menus) ===== -->
+    <record id="action_fp_account_holds" model="ir.actions.act_window">
+        <field name="name">Account Holds</field>
+        <field name="res_model">res.partner</field>
+        <field name="view_mode">list,form</field>
+        <field name="domain">[('x_fc_account_hold', '=', True)]</field>
+        <field name="help" type="html">
+            <p class="o_view_nocontent_smiling_face">
+                No customers on account hold
+            </p>
+        </field>
+    </record>
+
+    <!-- ===== Menu items under Configuration ===== -->
+    <menuitem id="menu_fp_invoice_strategy"
+              name="Invoice Strategy Defaults"
+              parent="fusion_plating.menu_fp_config"
+              action="action_fp_invoice_strategy_default"
+              sequence="60"
+              groups="group_fp_accounting"/>
+
+    <menuitem id="menu_fp_account_holds"
+              name="Account Holds"
+              parent="fusion_plating.menu_fp_config"
+              action="action_fp_account_holds"
+              sequence="70"
+              groups="group_fp_accounting"/>
+
 </odoo>
diff --git a/fusion-plating/fusion_plating_invoicing/views/sale_order_views.xml b/fusion-plating/fusion_plating_invoicing/views/sale_order_views.xml
index 3859f8d4..a9c9ad9d 100644
--- a/fusion-plating/fusion_plating_invoicing/views/sale_order_views.xml
+++ b/fusion-plating/fusion_plating_invoicing/views/sale_order_views.xml
@@ -5,4 +5,21 @@
     Part of the Fusion Plating product family.
 -->
 <odoo>
+
+    <!-- ===== Account hold warning banner on SO form ===== -->
+    <record id="view_sale_order_form_hold_banner" model="ir.ui.view">
+        <field name="name">sale.order.form.fp.hold.banner</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//form/header" position="before">
+                <div class="alert alert-danger" role="alert"
+                     invisible="not partner_id or not partner_id.x_fc_account_hold">
+                    <strong>Account Hold</strong> — This customer is on account hold.
+                    SO confirmation, invoicing, and shipping are blocked for non-managers.
+                </div>
+            </xpath>
+        </field>
+    </record>
+
 </odoo>