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Santiago Aguirre Acuña

for example when an internal transfer of a product is made which has 5 units on hand

The operation only detects as if there were only 4, which leaves the internal movement incomplete. This happens with all products, and regardless of the quantities, it always counts one unit less than what is actually registered.

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Cybrosys Techno Solutions Pvt.Ltd
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Hi,

If every internal transfer always shows one unit less than what is actually on hand, that usually points to a configuration or reserved quantity issue rather than a bug in the stock itself.


Here are some possible causes and how to check them:


1. Check Tracked Products

If the product is tracked by lot or serial number, Odoo requires you to assign them during transfers. If you don’t assign all 5 serials/lots, Odoo will only validate the assigned ones (for example, 4). That’s why it seems like one unit is missing. You can check this on the product form under the Inventory tab.


2. Reserved Quantities vs. On Hand

Go to Reporting > Inventory > Stock Moves and check if there is an already reserved move for that missing quantity (maybe for another transfer, delivery, or reordering). Odoo reduces the available-to-reserve stock by what is already allocated. For example: 5 on hand, but 1 is reserved for another picking, so you only see 4 available.


3. Double-Check Operation Type Settings

For your Internal Transfer operation type, check if the default source location actually contains all the stock. Sometimes the operation type points to a location that only has part of the inventory.


4. Test With a Fresh Product

Create a new product with no tracking, add 10 units via an inventory adjustment, then try an internal transfer. If the issue doesn’t appear, the problem is with tracking or reservations. If it still shows one less, it could be custom code or a bug in your Odoo version.


Hope it helps

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Santiago Aguirre Acuña
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I've already tried all 4 cases and these were my results.
- Option 1: Discarded. Reason: The error also occurs with products that are not tracked by serial/batch number.
- Option 2: Discarded. Reason: This error also occurs with new products that were recently created, so it's impossible for them to have been reserved before.
- Option 3: Discarded. Reason: The error occurs regardless of the origin or destination location of the transfer, even when the location has the necessary quantity on hand.
- Option 4: Discarded. Reason: I had tried this test before and the results were the same. I also discovered that for some reason when I make an internal transfer of 10 units and send all 10 in the order, the error occurs and I am left with 1 unit. However, when I send 9 units + 1 additional unit in the transfer order, the quantity error does not occur. However, in the case of transferring a single product, this option is not useful.