Once you have a made the change, you may have to log out and back in again to see the update.
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1. Click on the Cog

2. Click "Rename System Fields"

3. Select the module to work on

4. Each label can be edited here. This only affects the screen - it doesn't change the document variable name

5. Click on the tick to confirm the edit

6. To change the names on the item grid, click "Rename Line Item Fields"

7. Each can be edit here

8. And click on the tick to confirm