Project Accounting - One Project, Multiple Business Lines (Oracle EBS)

We have 7 business lines.When we create a project, do we need to create one project for all business lines or multiple projects for each business line, because we have separate operating unit for each business line.

Below are our requirements.

1. Revenue recognition is different for each business line

2. Invoice schedules(billing Schedules are different)

3. Auto accounting needs to hit correct company code, business line, accounts, region COA segments

4. When we get the contract from our customer, it might be one for all or combination of couple of business lines. There is a possibility that once the contract is signed for 2 business lines, change order may be for another business line.