The document lists frequently used CRM tables including tables for business partners (BUT000, BUT020, BUT050, BUT051, BUT0BK), addresses (ADR2, ADRC), products (COMM_PRODUCT), business agreements (CRMM_BUAG, CRMM_BUAG_H), order transactions (CRMD_ORDERADM_H), opportunities (CRMD_OPPORT_H), activities (CRMD_ACTIVITY_H, CRMD_ACTIVITY_I), leads (CRMD_LEAD_H) and other reference tables. It provides brief descriptions of key tables for transactions, partners, addresses, products and more. Notes explain that CRMD_ORDERADM_H