Question about average cost calculation for *OP items

Hi to all

we use a lot of subcontract and have about 10.000 "service" *OP items

Until last year we where reviewing and fixing our costs by using a customer cost method (method 51) and simulating and freezing this cost method to the standard costs

we used this procedure for all our purchased items including stocking type P and X

this year we want to have a more automathic method for updating our costs, so we want to simulate and freeze the 02 cost (average cost) to make It the new standard cost

But I'm not sure if 02 costs is updating for stocking type X items, if not, I will use cost method 08 (last invoiced cost)