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 on the same vessel at the same journey in Dalian and Qingdao separately, meanwhile, the B/L has marked different loading port and loading date.

Question: 

Do you think the export company breaches the L/C? Please list your reason.