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Product Rate Plan Charge for Percentage of Total

Our company is rolling out a service where we bill customers for the customer-support level they receive. The cost of the customer-support service is based on a percentage of the whole invoice. It would be helpful to have a rate plan charge that can calculate a percentage of the invoice total in one invoice line item.


I tried using a negative value in a percent discount product rate plan to calculate the customer-service charge. This works in achieving a correct invoice total but it creates a "discount" line item for each line item that already existed. Spreading the customer-service charge across multiple line items will be confusing for our customers, who would prefer to see the customer-service charge as one line item.