Projects assignment with Profit Center

Hi all of you,

We have lot of customer projects for which we are going to implement Project Systems. Actually, I thought of that for each Project I am going to create one Profit center which is to be assigned with WBS element means 1:1 relation between Project and the PCtr. But my client is asking that why we required the 1:1 relation since the project may closed once it is completed. My previous experience is 1:1 relation only. My question is, shall we able to take Profitability report for WBS element under profit center or not.

Please advice me what is the best practice i.e. 1:1 relation or N:1 ('N' no.of projects assigned to one PCtr)

Thanks & Regards

Ramki