Have you tried cash flow? You can select the target elements and timeframes. The element/s are readily available in General Accounting Lobby.
Which version of IFS are you using? Up to IFS Cloud there is Cash Flow Forecasting module which generates all the commitments, orders and outstanding invoices into a single overview window.
In IFS Cloud there is also the cash planning module which also takes the AP, AP, orders, POs, PRs same as cash flow forecasting but also takes sub contract valuation plans into account (if you are using sub contracts module). Cash planning supports multi-company, project or site specific cash plans amongst other improvements.