Default approver of the expense reports submitted by project manager on his/her own project?

Summary

Who approves the expense reports of project manager for the project based expense report?

Content

Hello All,

Per out of box functionality, for all the project based expense reports, the approval goes to the project manager by default. My question is what is the default functionality when project manager himself submits the expense report on the project where he, himself is the project manager? Does he approve his own expense report? If yes, it seems illogical and if not, who approves it? 

Thanks a lot!!

Amit
 

Version

R13 19A