Return packing with more quantity than the picking

On stock picking, you can create a return packing.

My answer is about the quantity of products in this return packing. When you create a return from a picking, you can choose the quantities of return products. But you can set more quantities on the return than the quantities of products in the first picking.

This creates a problem when you send 5 CPU3 to a customer. You invoiced these products to a customer. But he would return these products to you. You create a return from the Outgoing products and you write, by error, more quantity of product (for example 7 CPU3) than the customer return to you. OpenERP will create a Customers Refunds with 7 CPU3.

It's a problem because you refund the sum of 7 CPU3 to your customer but your customer paies you for 5 CPU3.

I think it's a functional bug, but I don't know where report this.