If you have created an invoice with several installments or if your customer pays you in installments, then these invoices will be displayed in cash flow forecasts until full payment has been received.
You will find the details of the installments by opening the invoice and selecting page 2. By default, the dates are set from the options defined in the ‘Payment Terms’ field and are relative to the issuing date of the invoice. However, you can modify these dates to make your cash flow forecasting more accurate.