Does Advanced Cost Accounting Cost Objects for Flex Accounting work for Realized Gains and Losses, T

We have setup the Flex Accounting for Advanced Cost Accounting for AR and it seems that it only works for the Financial AAI's RKD* and RT* AAI's  and does not populate for the RG* and RL* AAI's. We also need the Tax portion AE on Discounts to be populated  with the Cost Object as well as the Write-Off's on AR Receipts. We have setup the Flex for these accounts and the B03B0067 business function is not allocating the Cost Object and we are not getting any errors.