Fixed Assets - Half year rule.

I am currently trying to set up Fixed Assets in an Axapta 3 SP1 install. They use a depreciation profile that is 30% Reducing balance. However, in the year of Acquistion they want to depreciate the asset for 15% for the entire year regardless of the date of acquisition. I’ve tried to set up a value model that has an Alternative depreciation profile that uses 15% reducing balance. As Axapta always chooses the highest depreciation of the Depreciation profile and Alternative Depreciation profile the alternative is never choosen in the monthly run. I also looked at setting the Depreciation run date 1/2 year thru the fiscal year, but that skews the monthly depreciation as new assets depreciate their amount in the last half the year only. Any other suggestions?