I am having an issue with building parts in BW2018.  When I build a part, component parts that are being used and are being taken out of inventory. 

There are some parts however that their costs do not hit the general ledger.  That is, if I run a journal report, the costs of some parts do not debit or credit.

It seems to be related to be related to particular product line, but even if I change the product line of the part, it still does not hit.

Any ideas?