End-to-end responsibility for AP/AR & document management: invoice receipt (entry, formal check, forwarding, monitoring), creditor/debtor processes including master data, clarification cases and dunning, as well as documents of project companies, Payment transactions and treasury-related tasks: bank account maintenance and instruction/release of payments, Liquidity planning and monitoring for project companies, Support for reporting, bank reporting, and closing and accounting processes in cooperation with Accounting, ERP and process responsibility: process mapping/optimization in ERP, ensuring data consistency ('Single Source of Truth'), Interface communication with internal/external project participants, especially in cooperation with Asset Management