Applied for a Business visa with two entries

I applied for a business type for two entries of 90 days per stay of 6 months. And the embassy call me back and asked me if I've been to China before, and I haven't. So they told me that I can only get a business one of one entries of 90 days, because thats a rule they have and this mean that I have to travel all the way back to Denmark to apply for an new one. Do you know about this rule or heard about it before? or do you know where I can read about all the China rule in details?