When you are in Edit mode on an invoice, you can add detail records using the Add Detail button. Fill out the data fields for each item (Activity and Street/City fields are required prior to saving).
Click SAVE when done making entries
Your invoice will be saved (assuming there are no errors) and you will be able to start adding detail and time records.
Select the activity from the drop down list and enter the Street/City the work was performed in. The remaining fields (Units, Street Num, Crew, Cont WR#) may be filled in as well, but they are optional.
Click Save when done. If any required fields are missing you will see an error screen as shown below. Correct your missing entries and click Save again.