The WADTP accounts receivable payment statistic shows how long, on average, it takes a customer to pay invoices weighted by the amount of the invoice. It is calculated by subtracting the payment date from the invoice date for each fully paid invoice, then dividing by the total value of the invoices. Only fully paid invoices are used to calculate this statistic. Credit memos and other non-invoice-related accounts receivable transactions are excluded from this calculation. For an example, see Payment Statistic Calculations FAQ.