Book Two: Nominate Contracts · Section One: Contracts of Transfer of Ownership · Chapter One: Contract of Sale · Part One: Definition and Elements of the Contract of Sale
If the price is determined on the basis of weight, the net weight shall be taken into consideration, unless the two parties agree or custom dictates otherwise. Custom shall determine the tolerable amount of shortage in the goods resulting from transport or other reasons.
Interpretation and application must be checked against the official text and current version.