Product Line Accounting for FiFO cost method

 I would like to use Product Line Accountiing in an Organisation with FIFO as cost methodHave created a category set, assigned this as default to the Product Line Accouting default category set.

In Default Accounts I have assigned Material Accounts etc to each CategorySet combination

Not using WIP (it's a very basic set up) - did a Misc Transction (Account Alias Receipt)

And my Material Valuation Account is still the Account set at Organisation Parameter, not the one assigned to the Category Set combination. 

Do I have to fix this with Subledger Accounting? The downside is that the Distribution Account in CST is not correct, so I will miss out on a couple of Standard Reports and Inquiry Forms (unless I use a custom process to tie back the SLAM created CCID into the Distribution Details of the Misc Transaction.