My contract will expire on April 2016 here in Thailand but i have plans of visiting in China?

Hi my contract will expire on April 2016 including my N)N-B visa here in Thailand, but my boyfriend sponsored me a visit on the end of this month ( March) is there any possibility that they will not approved my L-type entry permit?

Another question is Does they require stamp on the invitation letter made by my german boyfriend whose a resident of PRC already?