The issue appears to be that the stock transfer is moving quantity but not inventory value. Since the item cost in the main warehouse is zero, deliveries reduce stock quantity but cannot generate COGS or accounting entries.

I would check:

• Inventory valuation method (FIFO, Moving Average, Standard Cost).

• Whether the goods receipt created a valid inventory cost.

• Whether the stock transfer carries inventory value between warehouses.

• Inventory and COGS account mappings for the item.

The root cause is likely the missing inventory cost in the main warehouse.

If you need further assistance with inventory valuation, accounting setup, or tax planning, feel free to contact Private Tax Solutions.

Hope it helps.

This behavior is expected if the stock transferred to the main warehouse does not have a corresponding Stock Valuation Layer (SVL) or inventory value associated with it.

A few points to verify:

1. Product Configuration

   • Product Type = Storable Product

   • Inventory Valuation = Automated

   • Costing Method = AVCO, FIFO, or Standard Price

2. Product Category Configuration

   • Stock Valuation Account

   • Stock Input Account

   • Stock Output Account

   • Expense Account

   must be configured correctly.

3. Stock Valuation Layer

   After the purchase receipt in the branch warehouse, check whether an SVL was created and whether it contains a non-zero value.

4. Transfer Route

   Internal transfers move both quantity and value only when the source stock has valuation attached to it. If the receiving warehouse gets quantity without valuation, the stock on hand may exist while the inventory value remains zero.

5. Single Company vs Multi-Company

   You mentioned "one main company with multiple branches under the same company." If these are warehouses of the same company, internal transfers should preserve inventory valuation. If the transfer is implemented through custom routes or locations that bypass valuation logic, quantity may move without value.

The fact that:

• Quantity exists in the main warehouse

• Product cost is 0

• Customer deliveries generate no COGS

strongly suggests that the inventory in the main warehouse has no valuation layer or zero inventory value. Since COGS is derived from stock valuation, Odoo cannot generate accounting entries when the inventory value is zero.

A good starting point is to inspect the Stock Valuation report and the Stock Valuation Layers for the product before and after the inter-warehouse transfer. If the transfer creates quantity but no valuation in the destination warehouse, the issue lies in the valuation flow rather than in the delivery process itself.