E1 9.1 Depreciation Method 15

Hi Community -

We are in the process of converting a division from World to E1.  In converting their assets, they are using a depreciation method = 15 and Compute Direction = P with a rate of 30% (there are different % rates being used for various asset categories).  In World, the assets were set up with a life of 1 month which in E1 is not working because it tries to depreciate the entire amount in the first month.

What is your recommendation for setting up the defaults?  What number for Life Months would you use?  A different life for each percentage (e.g.  40 months for 30%, 48 months for 25%, etc.) or can we use 999 for all % values which would be easier to set up but may not be the right solution.