Why Dynamic Variants Impact the MTO Flow (v19.0 Context)

Odoo supports three variant creation modes:

• Instant: all variants are created upfront. This provides full visibility but is limited to ~400 combinations due to performance constraints.

• Dynamic: variants are created only when added to a Sales Order. This is ideal for high variability but the variant initially has no vendor, which impacts MTO.

• Never: variants are not created and inventory traceability is not supported.

Industries with high variability often combine instant attributes (for key dimensions) and dynamic attributes (to avoid exceeding system limits). This setup is valid but directly affects how MTO behaves.

MTO limitation

To trigger MTO, Odoo requires:

• the MTO route enabled, and

• a vendor assigned to the variant.

With dynamic variants, the variant is created only after the SO is confirmed, so the vendor is missing at that moment.

Behavior before and after v19.0

• Before v19: the SO was blocked if the vendor was missing.

• In v19: the SO can be confirmed and Odoo logs a chatter warning (“No vendor found to replenish the product…”), but automatic replenishment is still not triggered, even if the vendor is added later.

Mixed attribute behavior

• Instant + Dynamic attributes: MTO works as expected.

• Multiple Dynamic attributes: Odoo prioritizes dynamic logic—SO confirmation is allowed, but automatic MTO is not triggered.

This behavior applies to fully dynamic products, mixed configurations, and products exceeding the instant-variant limit.

The workaround presented below addresses this limitation while preserving traceability.

Workaround (v19.0 Best Practice)

Below is the recommended method to replenish dynamic variants while preserving MTO traceability.

Step 1 — Enable Product Variants

Go to:

Sales → Configuration → Settings → Product Variants

Enable Variants.

Step 2 — Create Attribute Definitions

Use:

• Dynamic for attributes that generate many combinations}

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• Instant when full pre-created visibility is needed and limits are not exceeded

• 

  • If too many instant variants are detected, Odoo may show an error during variant generation (indicating that you should switch some attributes to dynamic).

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Step 3 — Configure the Product

• Route MTO enabled

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• At least one vendor assigned at the template level

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• Add all required attributes (these may include dynamic ones). 
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Step 4 — Create a Dynamic Variant via Sales Order

When the user selects the attribute combination:

• The dynamic variant is created

• The SO can be confirmed

Step 4.1 — Confirm SO

If the vendor is missing:

✔ The SO will still confirm in v19

✔ Odoo will log a chatter warning

✔ The MTO replenishment will not trigger automatically

Step 5 — Replenish Manually from Purchases

Since automatic MTO does not trigger for dynamic variants, follow this process:

1. Open the newly created product variant

   1. 
   2. 
      

2. Once in the Product Form Click On the Action button → Replenish

• • 

• 
  
  • Select the vendor, onfirm the replenishment

  
  

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  • A Purchase Order (PO) will be generated (The MAGIC)

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  • The PO will be automatically linked to the SO, preserving the traceability chain

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  • Continue with the standard flow:

    • RFQ → PO confirmation → Receipt → Delivery

  Even though replenishment is manual, the flow remains consistent and efficient.

  
  

Conclusion

This workaround allows using dynamic variants with MTO in Odoo v19 without blocking the sales flow.

It preserves SO–PO traceability, works with single or multiple dynamic attributes as well as mixed instant/dynamic configurations, and is especially useful for industries with high product variability.

By leveraging the flexibility introduced in v19, it avoids rework and keeps the operational flow clean and predictable.