[otrs] Customer Company

Hi! I have a question: What's the real function of the option Customer Company?, because i tried to created more than one customer in only one company, but a received this message: : Duplicate entry 'OnTop Inc.' for key 1, SQL: 'INSERT INTO customer_company ( customer_id, name, street, zip, city, country, url, comments, valid_id, create_time, create_by, change_time, change_by) VALUES ( 'jluis@cnti.gob.ve', 'OnTop Inc.', 'La Hoyada', '1010', 'Caracas', 'Venezuela', 'www.mcti.gob.ve', 'mcti', 1, current_timestamp, 7, current_timestamp, 7)' Then, maybe i'm confused but I thought that the function of the company client, is link several customers in just one company. Thanks!