Presumably some other design changes were made in between CM 8 and CM 9 that produced this side effect. You can move any of the lines around, but cannot make any changes to button 1 / Line 1 -- it is now special. I assume there are some extra under-the-hood database hooks to button 1. This is highlighted, depending upon which device type you are working with. For example, when accessing the Manage Button Associations page for a CIPC, you see Line 1 notes "Fixed feature - button 1" A 7821 does not show this note, but the behavior is the same.
The work-around at this point is to delete both buttons, and manually re-add them in the correct order. It may also possible to do the same thing via bulk updates, but nothing via the Modify Button Items link on the web page like you used to with CM 8.x.
I had the following defect created to track this issue, so be sure any TAC cases you open reference it and perhaps the developers will eventually fix this. Please pile onto:
CSCus20299 - Include method to switch lines 1 and 2 through modify button items
Interesting. If you can do this via API calls, it seems like it should be fairly straightforward for the developers to fix what they broke so it works natively within the GUI again. Unfortunately, this bug is currently at a low priority Sev 6. As more folks come across it, be sure to attach the bug ID to your TAC case to give it more visibility so that it can get fixed before the years roll by. Cheers!
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