How can we search project costs by project business unit?

Hi,

We upload an expenditure batch which expenditure business unit is different from project business unit (e.g. expenditure BU is A, project BU is B), we can search this expenditure batch/cost after assigned business unit A data access to project accountant role. But there's another employee which only assigned business unit B data access also needs to search the costs, how can we customize the role to access the project costs by project business unit?

Thanks