Stock reapearing after out of stock!

[juanjico]

Hello!

I have an strange stock behavior. I'm using advanced stock management for my products.

The stock is reappearing after a product is out of stock.

For example: A few days ago a customer purchased all my stock for a product. Then, the stock is 0 for this product. OK!

Now, I received a new order for this product! Then checked and I have two pieces of this product. That's impossible!

Then I go to Stock->Instant stock status, and for this product I have for physical and usable quantity: 2 pieces, and real quantity I have one piece.

If I go to Stock movement, and manually calculated all movements and are perfect! If I sum all supply orders, and subtract all customer orders, the result is ZERO.

Then I go to stock management and there are 2 pieces. So I try to remove one piece so this product is out of stock again and I got the error 'You don't have enough usable quantity. Cannot remove 1 items out of 0. '

The unique way to remove the piece if modifying the database by hand.

I'm really lost with this. Is happening for a lot of products that are out of stock.

Any idea ???