One trading company in China exported 1000 M/T beans to Australia, the L/C opened by importer stipulated that: Partial shipment is prohibited. As a result, the company in China shipped 500 M/T captioned goods at the same journey in Dalian and Xingang(Tianjin) separately, meanwhile, the B/L has marked different loading port and loading date.Question: Do you think the export company breaches the contract? Please list your reason.