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For a manual transfer between warehouses, you typically do not need a custom Operation Type that manually chains all the pickings. Instead, configure an Inter-Warehouse Transfer Route that uses a Transit Location.

Your route should define pull rules similar to:

• Transit → BUR/Input

• BUR/Input → BUR/Stock

• SOF/Output → Transit

When you create a transfer from SOF to BUR (or a replenishment generated through the route), Odoo will create the required chained pickings automatically according to the warehouse reception and delivery steps.

A common reason why no transfer is generated is that the route is not assigned to:

• The product, or

• The product category, or

• The warehouse replenishment configuration.

Also verify that:

• Multi-Step Routes are enabled.

• Multi-Warehouses are enabled.

• The Transit Location is configured as an internal/transit location.

• The route rules have the correct source and destination locations.

• The procurement group is created from a demand (replenishment, reordering rule, or transfer request).

If your goal is to manually select products and create a transfer request, Odoo's standard Replenishment Between Warehouses feature is usually the recommended approach. With the route configured correctly, Odoo will generate the necessary pickings across both warehouses, including the transit movements, without creating each operation manually.