Why Oracle EBS Inventory is allowing 0 Qty transactions to go to MTL_MATERIAL_TRANSACTIONS

For a couple of months, already, we had found Uncosted transactions jeopardizing the month-end process. While looking at these transactions, we had found that those material transactions have zero (0) quantity, and therefore, zero cost.

In theory, the Cost Manager should ignore these transactions, but because they remain uncosted, they prevent user form completing month-end closing tasks.

Do you know why Oracle is allowing these zero-quantity transactions move to the MTL_MATERIAL_TRANSACTIONS, how to avoid it? Why Cost Manager is not marking as processed if they're allowed and no impact on cost accounting?

Thank you for your feedback.

Oscar.