Section 367.4050 - Account 405, Amortization of other property(a) When authorized by the Commission, this account must include charges for amortization of intangible or other property that does not have a definite or terminable life and that is not subject to charges for depreciation expense.(b) This account must be supported in sufficient detail to show the amortization applicable to each investment being amortized, together with the book cost of the investment and the period over which it is being written off.