Fixed 30 day pro-rate regardless of calendar month...

Hello,

I'm setting up FA to meet a local countries requirement.

Assets are depreciated based on 30 days in a month (regardless of month), with 360 days a year. 

So a simple example: Assets acquired on 12/02/2015 for 1783.89 with depreciable life being 1 year (Software)

First depreciation is on 31/05/2015 : 1738.89/360x(19+30+30+30)=526.49

No of days : (19+30+30+30) Feb+Mar+Apr+May=109

What's the best way please of tackling the 30 day prorate at the beginning and end of the assets life? 

Using Oracle R12.1.2

Regards

Dave