OPM Acutal Cost (PMAC) for by-product accounting

  

        Dear Expert ,

               How to reconcile INVENTORY value for by-product ??

               My test samples is one by-product has previous cost and balance (  Cost = $20 , previous balance quantity = 10 kg)

               Current period , by-product complete  10kg . And did cost adjustment ( total by-product value in this period is 300. so did cost adjustment by  Quantity 10 kg and cost = $30 ) .

               Then run Actual cost process . By-product current period cost =>  ( previous value + current value ) /  (previous quantity + current quantity) = ( 200 + 300) / 20 =  $25.

               And the Accounting in the batch FOR by-product is  Dr. INV- BY PRODUCT  250     Cr. WIP  250

               In the period end  , total inventory value = average cost * balance  = $25 * 20 = 500 .  

               But transaction journal = previous balance + current period transaction = 200 + 250 ( By-product complete journal) = 450 .