Using Odoo CE 13, with a minimalist setup as we are only using Odoo to manage our inventory related workflows.

Modules enabled: Contacts, Inventory + Invoicing and WMS Accounting (due to dependency, not relevant for the question)

Configuration

• Single company

• Multi step routes enabled

• Multiple warehouses enabled

• Warehouse to fulfil delivery orders is set to "Deliver goods directly (1 step)"

• The route related to it has 2 pull rules - listed below in the order they should execute. The locations mentioned are all views, not internal locations as the internal locations are one level down from FGCG/Pick and FGCG/Store (e.g. FGCG/Pick/AA01-01-01)

• Rule 1 (sequence 21): When products are needed in Partner Locations/Customers, Delivery Orders are created from FGCG/Pick to fulfill the need. If the products are not available in FGCG/Pick, a rule will be triggered to bring products in this location.

• Rule 2 (sequence 20): When products are needed in FGCG/Pick, Internal Transfers are created from FGCG/Store to fulfill the need.

Problem

When I create a planned Delivery order for the warehouse for a product that doesn't have enough stock anywhere in FGCG/Pick, then Mark as todo, then Check availability, the available stock is reserved, but internal transfer is not created to transfer stock from FGCG/Store to FGCG/Pick to cover the shortfall. The delivery order remains in Waiting status.

I've researched this topic for the last few weeks, but it feels like I'm missing something obvious.