PLA Setup - Category Account defined not fetching transaction account

Dear All

     required assistance to complete Product line accounting setup

Objective : required to fetch different inventory valuation account for different item categories[ Raw Material, Finished Goods, Scrap etc..] rather than default inv organization account

   Steps completed,

    1.Configured new category flexfield, create category set  and assigned Default Category Set for Product Line Accounting [Categories, Raw Material, Finished Goods, Scrap]

    2. Defined different inventory valuation for each of category using Category Account Window

    3. Created items and assigned Product Line Accounting in organization level

Result : while performing transaction still taking inventory account from organization parameters... not from above defined category accounts

Instance 12.1.3

Costing Method : Average Costing