Go to Reports > Financials > Payment Report.
Generate the report on payment types for the invoices within the period (select invoice date filter).
and for the invoices before the period (select invoice date filter)
Unpaid invoices report
Generate the report for unpaid invoices.
Go to Reports > Financial > Unpaid invoices.
Select the department and the date.
Unallocated payments – Prepayments
Generate the report for unallocated payments (prepayments).
Go to Reports > Financial > Payments.
Select start and end date. Select Department. Select Payments > Prepayments.