# How to configure in Sales, Product Quantity (units) along with Weight (kg)

Hello, So far, we couldn´t find a way to configure the Product`s unit of charge in such a way that we initially generate a sales order for 40 chickens where the client and salesman don´t know the exact weight at that moment. Here, only the units of chickens are accounted at first. Then, next day in the morning, the people at dispatch in the warehouse according to availability selects 40 chickens to weight them to get the exact weight in kilograms, for instance, 84.4 kgs. thus, charging 2 dollars for the total amount of kilograms (84.4kg) instead of charging 2 dollars per chicken which is how OpenEPR wants to do it now.

In other words, we would like some assistance to know how to add an additional variable on the sales order when is about to be approved while inputing the exact weight and thus charging the correct amount of money according to total kilograms and not units.

The weight of chickens are never the same individually, and so there is no way of knowing in advanced when the sales orders are created. This sales orders are revised in the warehouse and shipped the next day, with the exact weight and price.

Perhaps someone knows where I can find an example or similar case to learn from it.

Thanks in advance for any help!

it's still the only solution:

https://www.odoo.com/apps/modules/11.0/tis_catch_weight/