Vertex - Multiple Operating unit Question

We currently use Vertex Sales Tax Q series (version 4.X) tax engine on top of Oracle AR 11.5.10. Currently we have a singe operating unit which is attached to a LE and is hooked onto Vertex as the Tax Vendor in our system options. Now we are setting up a new company/operating unit in AR which is then attached to a separate LE. The problem is that when the vertex calls are made from new operating unit, it still uses 01/01 as the company code/division code as a result of which these values are populated in vertex.regsprereturns table. This creates