Field help (PRIREGS) 

Use this field to define whether average costs are to be recalculated by the Cost adjustment function (FUNSTKADJ) for the products associated with this valuation method.

 This field is only available where the main valuation method is based upon the average value of stock. That is method Cumulative AUC, Lot AUC, LIFO cost or FIFO cost is defined in the field Method 1.

Average costs are only recalculated using the primary valuation method.