Requisition Position Hierarchy Approvals when HCM LE-BU and Finance LE-BU structures are different

We have a requirement where the HCM LE-BU structure is going to be different from the Finance LE-BU structure. As I understand Oracle standard functionality is that Positions are BU based and when Requisition Approvals are implemented based on Position Hierarchy, the hierarchy can be derived from the requester’s/preparer's/overriding approver's HCM assignment, rather than the Requisitioning BU selected on the user preferences/requisition even in the case the spend is financially owned by a different BU/Legal Entity - the approval hierarchy would always be based on employee's BU assignment. Is it possible to extend approvals to incorporate approvals on the requisition