Traveling to China on a one way ticket, but I have my (L) Tourist Visa already

I am getting my tourist L type through a letter of invitation, NOT a roundtrip ticket. Once I have the L type, will it be a problem to enter China on a one way ticket with just an (L) Tourist type? Will i get stopped at the airport, or at customs? Or will it be okay? I am flying on a US passport from San Francisco to Guilin.

As long as I have my Tourist L type, it shouldn't be an issue if I fly into China on a one way ticket, right?

I ask because I am flying into Guilin, but taking a train to HKG one week later and flying out from there. So that is why I have a one way ticket to China.