Sales By Item Summary report shows total for sub-item but not for parent item
Most of our customers pay several invoices with a payment that also includes deductions for things like advertising costs, shortage or damage claims, etc. we then issue a credit memo to apply to the resulting balance that remains on any invoice included in the payment.
I set up an item "Advertising" linked to the Advertising Expense account, and then I set up sub-item to track advertising of specific products, because some of the advertising charges our customers deduct are for general advertising and some are for promotion of specific products.
Over the past year, I created several credit memos with multiple line items for the various advertising deductions taken by customer. Now I am reviewing our sales data for specific customers, and I know the total for the item "Advertising" (general advertising), is much more than all product-specific advertising combined. However when I run a "Sales By Item Summary" report, the amounts from the credit memos for the sub-items is on the report, but the main "Advertising" item is totally missing. What could be causing this?