Normally when we do time and material based invoices (especially for customers where we do support and obviously then do not know the support activities in advance), our customers require that we add a detail time report to the invoice that supports the hours invoiced. The time report has to detail our activities on a daily basis.
Because the current time entry pages on PPO only supports notes on a weekly basis we cannot use the time reports from PPO and we have to keep separate spreadsheets for time reports for invoicing purposes. Please consider adding functionality to add notes on a daily basis, and then enhance the current time reports to allow reporting of notes and activities on a daily basis.