Depreciation w.r.t entered Depreciable amount.

We are in phase of migrating the assets data from our old system to PeopleSoft Asset management. There are certain adjustments that have already been made to cost and depreciation in older system. Now we want to have those assets to be migrated with the actual cost and depreciable amount so that the future depreciation should be calculated w.r.t depreciable amount that is entered to the Oracle system.

Currently we have uploaded assets with accumulated depreciation but in this case this happened that future depreciation is calculated on the basis of current Net book value(NBV) of that asset which is not correct for us as we are using straight line method for new assets.