The commercial invoice provides information on the purchase price of the delivered goods or goods to be delivered. The Customs in the destination country use it to determine the customs value. The commercial invoice is subject to minimum requirements in their layout. Usually, it contains the commercial description of goods, quantity, weight, type and number of packaging, as well as the amount invoiced and the invoiced currency. In addition it may contain information of it the country of origin of the goods. Thus, the commercial invoice is an important document in foreign trade.