Employee Claims - Employee assigned to Single Common BU

Summary:

Employee Claims - Employee assigned to Single Common BU

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Customer in IT Service industry and operating from multiple countries. HCM team assigned all employees to common BU (where we don't perform any transactions) and implemented the project.

Business would like to implement Fusion expenses and should be charged expense in respective business unit where employee is located or working. Business created one BU country wise... Due to employees assigned one common BU where transaction are not performed. How to overcome this issues?

Do we need to suggest business to assign employees in respective business units so expense will be charged and ap invoice will be created in respective BUs?