Adding existing assets to Sage X3 FA Module

SUGGESTED

In the past we did not use the fixed asset module.  I'm now moving our assets into Sage.  First, we were told that we have to use accounting method "RE", where we now use straight line, in order to input the existing accumulated depreciation.  Is that accurate?

Next, I'm trying to add an asset manually to test.  However, regardless to what accounting method I use, it will not let me fill in the Deprec. Total field under the Depreciation tab.  Am I in the correct spot?