If you wish to run a report for customers with a particular product, you can fulfill the request by creating a custom report with following steps:
1. Select RatePlanCharge in Data Source section.
2. In Column selection, select the appropriate columns/fields which you want to show in the report, such as Account.Name, Account.Number. Subscription.Name,Product.Name,RatePlan.Name,RatePlanCharge.Name.. etc.
3. Create 3 filters, Rate Plan Charge name=Prompt the user and Account status= active and subscription status=active
4. (Optional) In Sorting section, add column you wish to sort, such as sorting on Subscription.number or Account.Name.. etc.