Shows the revenue simplified entity. INVOICE defines INVOICE PAYMENT TERM. INVOICE defines EVENT INVOICE DELIVERY. INVOICE paid with INVOICE PAYMENT ASSIGNMENT. INVOICE PAYMENT ASSIGNMENT settled by ACCOUNT PAYMENT. ACCOUNT PAYMENT includes ACCOUNT REFUND. ACCOUNT REFUND is paid to ACCOUNT. INVOICE receives ACCOUNT. ACCOUNT belongs to CONTRACT. INVOICE ITEM recorded in GL REFERENCE. INVOICE summarizes INVOICE ITEM. INVOICE ITEM includes INVOICE DISCOUNT. INVOICE ITEM provides INVOICE ITEM DETAIL. INVOICE DISCOUNT on PRODUCT. INVOICE ITEM used as PRODUCT RATING PLAN DETAIL.