Why was my visa Application rejected?

My Name is Shiraz Faizer, I applied today along with my Company Managing Director who has previously travelled to China once. His Application was accepted and my application was rejected. I need to know what more should I submit? The documents that we submitted are:
1. Duly Filled Application Form with Colour Passport photo attached.
2. Passport Originals & photo copy
3. Invitation letter from China Material Supplier
4. Travel Itinerary from the Travel Agent in Sri Lanka.

Please let me know what else we need to submit along with the above documents.
Rgds,
Shiraz Faizer