The Default Expenditure organization problem for Project time card cost

Hi,

We use project costing time card in project time and labor module, when import project time card costs, it'll use employee's department as default expenditure organization.

Users won't enter the expenditure organization in time card, and we only want to use BU as expenditure org in PPM module, is it possible to revise the default expenditure organization from employee's department to employee's BU or project's BU when import time card cost?

Thanks