More cost of sales traceability

We have a customer who have had some cost of sales discrepancies, they use manufacturing, sales orders and traceable items with actual costings. Looking at the postings in the nominal, the postings relate either to the Works order or to the Sales order. For example the Sales order could have many lines and the postings in Nominal could have many cost of sales postings. When the customer tries to find where the cost of sales postings have come from - they can find the order but not what item it relates to. This then causes a long manual process of trying to work it out. It would be good that where postings are made if there is some way that the item code can be included in the narrative or something that would help them tie it back to the actual posting.