Odoo 19 Multi-Warehouse Routing:
Push, Pull & Make-to-Order Rules Explained

# A push rule is a stock.rule with action = 'push'
# Example: automatically move goods from Input to Stock

rule = env['stock.rule'].create({
    'name': 'Input → Stock (Auto Push)',
    'action': 'push',
    'route_id': receipt_2step_route.id,
    'location_src_id': input_location.id,      # Source: WH/Input
    'location_dest_id': stock_location.id,      # Destination: WH/Stock
    'picking_type_id': internal_transfer.id,    # Op Type: Internal Transfer
    'auto': 'manual',   # 'manual' = create picking, 'transparent' = no picking
    'delay': 0,         # Days to wait before creating the move
})

<odoo>
  <!-- Route: Receive in 2 Steps (Input + Quality) -->
  <record id="route_receipt_2step_qc" model="stock.route">
    <field name="name">Receipt: Input → QC → Stock</field>
    <field name="warehouse_selectable">True</field>
    <field name="sequence">10</field>
  </record>

  <!-- Push Rule 1: Input → Quality Control -->
  <record id="rule_push_input_to_qc" model="stock.rule">
    <field name="name">Input → Quality Control</field>
    <field name="action">push</field>
    <field name="route_id" ref="route_receipt_2step_qc"/>
    <field name="location_src_id" ref="stock.stock_location_company"/>
    <field name="location_dest_id" ref="quality_control_location"/>
    <field name="picking_type_id" ref="stock.picking_type_internal"/>
    <field name="auto">manual</field>
  </record>

  <!-- Push Rule 2: Quality Control → Stock -->
  <record id="rule_push_qc_to_stock" model="stock.rule">
    <field name="name">Quality Control → Stock</field>
    <field name="action">push</field>
    <field name="route_id" ref="route_receipt_2step_qc"/>
    <field name="location_src_id" ref="quality_control_location"/>
    <field name="location_dest_id" ref="stock.stock_location_stock"/>
    <field name="picking_type_id" ref="stock.picking_type_internal"/>
    <field name="auto">manual</field>
  </record>
</odoo>

# 1. Enable the MTO route on the product
#    Product form → Inventory tab → Routes
#    Check: "Replenish on Order (MTO)"

# 2. Ensure the product has a vendor or a BoM
#    MTO needs a source. Without a vendor (for 'buy' rules)
#    or a Bill of Materials (for 'manufacture' rules),
#    the procurement will fail with:
#    "No rule has been found to replenish..."

# 3. What happens when a SO confirms:
#    - SO line creates demand at Customer Location
#    - Delivery pull rule: Customer <-- WH/Stock (procure_method='make_to_order')
#    - Because procure_method='make_to_order', Odoo does NOT check stock
#    - Instead, it cascades to the next rule: Buy or Manufacture
#    - Result: PO or MO is auto-created, linked to the SO

# Create a reorder rule that triggers on-demand procurement
reorder = env['stock.warehouse.orderpoint'].create({
    'product_id': product.id,
    'warehouse_id': warehouse.id,
    'location_id': stock_location.id,
    'product_min_qty': 10,     # Reorder when stock falls below 10
    'product_max_qty': 50,     # Order up to 50 units
    'qty_multiple': 5,         # Order in multiples of 5
    'route_id': buy_route.id,  # Use the "Buy" route for procurement
    'trigger': 'auto',         # Run scheduler automatically
})

# With this setup:
# - Sales orders ship from stock immediately (MTS behavior)
# - When stock hits 10, a PO is auto-created for 40 units
# - No manual intervention needed

# Change delivery from 1-step to 3-step (Pick + Pack + Ship)
warehouse = env['stock.warehouse'].browse(1)
warehouse.write({
    'delivery_steps': 'pick_pack_ship',
    # Options: 'ship_only', 'pick_ship', 'pick_pack_ship'
})

# Change reception from 1-step to 2-step (Input + Stock)
warehouse.write({
    'reception_steps': 'two_steps',
    # Options: 'one_step', 'two_steps', 'three_steps'
})

# Odoo automatically:
# 1. Creates the new locations (WH/Packing Zone, WH/Output)
# 2. Creates new operation types (WH: Pick, WH: Pack)
# 3. Creates the route with chained pull rules
# 4. Archives the old 1-step route

# WARNING: Changing steps while transfers are in progress
# does NOT retroactively update existing pickings.
# Complete or cancel all open transfers first.