When editing individual line items on invoices, you have the option to update the corresponding time entry that the line item was generated from.
There may be situations where you will or will not want to use this check box.
When the checkbox is selected, the edits that you make will flow back to the time list, potentially impacting productivity. If there is something as simple as a typo in the description, you would most likely want to check this box off to apply that correction to the view on the time list.
If you update the "Quantity," that will impact the time worked.
Ex: Let's say you have a 1 hour time entry. After reviewing the invoice, you decide to charge the client for 30 minutes so you edit the quantity to .5. If you check off the update box, this will change the hours worked from 1 hour to 30 minutes. If you do not want the number of hours worked to be changed, you would leave the checkbox unselected. Then your hours worked will remain the same, but your hours billed will be changed. These differences can also be viewed on the Timekeeper Productivity Report under the "Adjusted" Column.
Applying a line item discount will not impact the original time entry regardless of if you check that update box or not. Discounts apply to the AR balance only and not actual time entries themselves.