Odoo Reordering Rules: Automatic Replenishment Setup Guide 2026

Stockouts cost businesses revenue, customer trust, and operational efficiency. Manual reordering is error-prone and time-consuming. Odoo's reordering rules automate the replenishment process, triggering purchase orders or manufacturing orders when stock falls below your defined minimum levels.

How Reordering Rules Work

Reordering rules are simple in concept: when the forecasted stock for a product drops below the minimum threshold, Odoo automatically generates a replenishment order to bring stock back up to the maximum level. The system handles the complexity of calculating when and how much to order.

The formula is straightforward: Order Quantity = Maximum − Forecasted Stock. If your minimum is 50 units and maximum is 200 units, and forecasted stock drops to 30, Odoo creates an order for 170 units.

What Counts as Forecasted Stock

Forecasted stock considers more than just what is physically on hand. It includes:

• On-hand quantity : Products physically in stock
• Incoming quantities : Confirmed purchase orders not yet received
• Outgoing quantities : Confirmed sales orders not yet delivered
• Reserved quantities : Stock allocated to specific operations

Enabling Reordering Rules

Reordering rules are available in Odoo Inventory out of the box, but proper configuration requires understanding several related settings.

Step 1: Check Multi-Step Routes

Navigate to Inventory > Configuration > Settings. Enable Multi-Step Routes if you need replenishment between warehouses or through intermediate locations. For simple buy-to-stock scenarios, this is optional.

Step 2: Configure the Buy Route

Each product needs a route that tells Odoo how to replenish it. The Buy route triggers purchase orders. Go to the product form, open the Inventory tab, and add Buy to the Routes field. For manufactured products, add Manufacture instead.

Step 3: Create the Reordering Rule

From the product form, click the Reordering Rules smart button. Create a new rule with these fields:

• Location : Usually WH/Stock (your main stock location)
• Minimum Quantity : The threshold that triggers replenishment
• Maximum Quantity : The target stock level after replenishment
• Quantity Multiple : Rounds the order quantity (useful when suppliers sell in fixed quantities)

Configuring Minimum and Maximum Quantities

Setting the right min and max values is the most important decision when configuring reordering rules. Get this wrong and you either order too frequently or tie up too much capital in inventory.

Calculating Your Minimum

The minimum should cover demand during your supplier's lead time plus a safety buffer. Calculate it as:

Minimum = (Daily Usage × Supplier Lead Time in Days) + Safety Stock

For example, if you sell 10 units per day, your supplier takes 5 days to deliver, and you want 20 units of safety stock: Minimum = (10 × 5) + 20 = 70 units.

Calculating Your Maximum

The maximum should balance ordering efficiency with storage costs. Consider:

• Supplier minimum order quantities : If your supplier requires orders of 100+, your maximum should accommodate this
• Storage capacity : Physical space constraints limit how much you can stock
• Cash flow : Higher maximums tie up more working capital
• Order frequency preference : A higher maximum means fewer but larger orders

Using Quantity Multiples

When suppliers sell in case packs or pallet quantities, set the Quantity Multiple field. If your supplier ships in cases of 12 and Odoo calculates a reorder of 45 units, the system rounds up to 48 (4 cases).

Running the Replenishment Scheduler

Reordering rules do not trigger in real time. Instead, Odoo uses a scheduled action called the Reordering Rule Scheduler that runs periodically to check all rules and generate orders.

Manual Execution

Go to Inventory > Operations > Replenishment. This view shows all products that need reordering based on current rules. You can review, modify quantities, and confirm orders directly from this screen before committing.

Automated Execution

The scheduler runs automatically based on the configured frequency. By default, it runs once per day. You can adjust this at Settings > Technical > Scheduled Actions > Stock: Run scheduler. For high-volume operations, consider running it every 4-6 hours.

Order Types Generated

Depending on the product's route, the scheduler creates:

• Purchase Orders : When the Buy route is active. Orders are created in draft status for review before confirmation.
• Manufacturing Orders : When the Manufacture route is active. MOs are created with components automatically reserved.
• Internal Transfers : When replenishment routes move stock between warehouses or locations.

Multi-Warehouse Replenishment

When operating multiple warehouses, reordering rules can trigger inter-warehouse transfers instead of external purchases. This requires configuring replenishment routes.

Setting Up a Replenishment Route

Create a route at Inventory > Configuration > Routes with rules that define the flow. For example, a "WH2 → WH1" route might specify: when WH1 needs stock, create an internal transfer from WH2 to WH1. The source warehouse must have sufficient stock for the transfer.

Cascading Replenishment

In a multi-warehouse setup, a single product might have multiple reordering rules : one per warehouse location. The scheduler evaluates each rule independently. If WH2 runs out, its rule triggers a transfer from WH1. If WH1 also drops below minimum, its rule triggers a purchase order from the supplier.

Make to Order (MTO) as an Alternative

Reordering rules work best for stock products. For made-to-order scenarios, consider the Replenish on Order (MTO) route instead. With MTO, Odoo creates a purchase or manufacturing order each time a sales order is confirmed, without maintaining stock levels. This eliminates carrying costs for slow-moving items.

Common Mistakes and How to Avoid Them

• Forgetting to set the Buy route : The most common error. Reordering rules without a Buy or Manufacture route will not generate orders. Always verify the route is set on the product.
• Setting min equal to max : This creates zero buffer and triggers constant reordering. Always set max significantly above min.
• Ignoring lead times : If your minimum doesn't account for supplier lead time, you will stock out before the order arrives. Always include lead time in your minimum calculation.
• Not monitoring the replenishment dashboard : Automated rules can create unexpected orders if demand patterns change. Review the replenishment view weekly.
• One rule fits all : Different locations may need different min/max settings. Create separate rules per location when warehouses have different demand patterns.

Summary

Frequently Asked Questions

References

• Odoo Documentation : Reordering Rules
• Odoo Documentation : Automated Purchase Orders
• Infintor : Odoo 19 Reordering Rules Guide
• Odoo Documentation : Routes and Rules
• Braincuber : Odoo Replenishment Rules Guide