I can edit the Amount on the End of Group line without getting errors in the UI, but I get errors if I do it in script. Why?

AI generated answer (using internal Slack threads):

****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ****** The error you're encountering when trying to edit the Amount on the End of Group line via script is likely due to the fact that the End of Group line is a system-generated summary of the group items. It's not meant to be directly edited, as it's a calculated field based on the items within the group. In the UI, you're able to edit the Amount field because the system recalculates the End of Group line based on the changes you make to the individual items within the group. However, when you're trying to do this via script, you're essentially trying to directly modify a system-calculated field, which is not allowed. The error message you're seeing, 'You cannot edit the end of group line. You must delete the group.', is typically triggered when a script or workflow is trying to directly modify the End of Group line. If you have any scripts or workflows running on the Invoice items sublist, you might need to add a condition to exclude the End of Group line from being updated. To resolve this issue, you should review your scripts and workflows, and add a condition to only update items in the sublist that are not description items or do not contain “End of Group”. This should prevent the error from occurring.