The document lists various inputs that are required for the procure-to-pay (P2P) process. These include vendor selection documents, purchase requisitions, purchase orders, material receipts, quality inspection reports, invoices, debit/credit notes, valuation reports, tax accounting documents, vendor balance confirmations, and documents related to period end processes like write-offs and confirmations. Maintaining these various documents is necessary to properly manage the P2P process from vendor selection through payment.