• Supporting of accounting tasks with specialization at the logistics program SAP at the following types:RES input, input of offsetting registration, Supplier creation, entry in the account and check of the Suppliers and Customers data, entry in the General Ledger.• Handling of orders via the internal program of IT system of CERTH.• Affirmations sending of withholding tax.• Filling of invoices and bank receipts.• External tasks (Z Tax Office & Banks).• Bookkeeping