Hi,

In Odoo, it is indeed possible to enter a return quantity that exceeds the original delivered quantity. When initiating a return through a "Reverse Transfer," the system pre-fills the return quantities based on the original delivery, but the quantity field remains editable, allowing users to manually input a higher value.

To prevent users from returning more than what was originally delivered, Odoo does not provide a standard configuration setting. This restriction would require custom development. A developer would need to implement a validation rule within the stock.picking model to check if the entered return quantity for any product surpasses its corresponding delivered quantity from the original order, and then block the return operation with an error message if this condition is met.