Any potential problems with Chinese visa application from a China born, US citizen?

My husband was born in PRC, left to live in Hong Kong when he was one, and later immigrated to US when he was 9. His American passport states he was born in PRC. He has never visited PRC and never held any PRC passport. Looking at the application Form (for tourist), would he be asked to produce a former PRC passport, which he does not have? Would he encounter problems with his application, then? We are thinking of joining a group tour to PRC.