THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
What's on the screen?
To do 
How do I add a party role to an invoice?
...
How do I update a party role on an invoice?
A party role cannot be updated via the current user interface. It can only be removed. If a party role needs to be updated then the entry must be deleted and then re-created. To do
How do I remove a party role from an invoice?
...
Example: To remove a party role from an invoice
- Locate the entry that needs to be removed
- Press the 'Remove' button next to the entry that needs to be deleted
- The entry is now removed from the list of invoice roles