Expense Approval Cost Center Manager is not retrieved based on Business Unit

Summary: We have an expense approval rule where the condition is when "Cost Center Total.Cost Center is not Expense Report.Default Cost Center" then it should route to User "Cost Center Total.Manager Username".

In our case the Cost Center P123 is there in two different business units X1 and X2. Both these business units are under different Ledgers following different COA Value Sets V1 and V2. For Value Set V1, the Cost Center P123 approver is A1 and for Value Set V2 Cost Center P123 the approver is A2.

Our expectation is when the expense is submitted from business unit X1 using cost center P123, it should route to the approver A1 only. But the system is sending the both A1 and A2 as approvers.