electronic invoice attach to purchase invoice transaction and auto prepayment, accrual and deferred income

Hi Development Team, Would you please consider add the function scanned or electronic invoice to be attached to purchase invoice. PS financial, SAP and other accounting system has this function. also automatic prepayment and accruals posting. when you book prepayment invoice, you enter information time range starts and ends to cover the cost. system automatically calculated and release in future period. there should be auto deferred income and accrual expense too. it makes our life much easier. thank you. Naomi