TLAHUAC ZONE ACTIVITIES Receiving, tracking, and controlling documents. Collections Account clean-up Reporting of invoices and credit notes. Control of customer file archives. SAP management Field/office audits **Monday to Saturday at the following times:** M \- F from 9:00 a.m. to 6:00 p.m. and Saturdays from 9:00 a.m. to 2:00 p.m.