This will be caused by either of the following:
- The "Billing Through Date" entered on your invoice batch creation is prior to the entries in question.
- Your project is set up to "Bill at Project Closing". If this is the case then your entries will not be able to bill until the project status is set to "Closed". If you want to bill regularly for time/expenses, you will need to edit this setting.
To Change a Project from "Bill at Project Closing" to "Bill Regularly":
- Click on the Projects tab
- Choose the project
- Click on the Edit button
- In the Payment Due Upon field, select "Bill Regularly"