Following is the quote from the FASB:
QUOTE
At the May 11, 2005 meeting, the Board asked the staff to analyze how the accounting for a defined benefit pension plan that provides active participants with the right to receive a lump-sum cash settlement upon termination or retirement might be impacted by changing the measurement of the accumulated benefit obligation (ABO) for purposes of calculating the minimum pension liability. For such a plan, the measure of the ABO for each participant eligible for a lump-sum payment would not be less than that amount.
Technically you are right, they are talking ABO, not PBO, but how reasonable would be be to have an ABO > PBO?
As far as I know, there has been no movement on this issue since around May 2005. Does anyone else know anything?
FASB