Hello. We are in V16, and we have a client who carries out his import processes in a specific way, that is, he buys his products, imports them, receives them and sells them. 

However, they process the costs at destination up to 1 or 2 weeks after receiving the product. And in that period of time, they sell products, but the problem is that all their products must have a shipment number (PEDIMENTO) to place it on the sales invoice. 

And odoo does not allow the shipment number (PEDIMENTO) to be assigned if the landed costs are not assigned. 

Or we can to modify the landed costs after that we receive an sell the products?

Does anyone know of a solution or similar case?