T46G - How to "lock" the line keys?

[CWR]

I would expect you have to skip those BLF's when programming.
Look at the programming in the phone WebGUI DSS Page.
The LOCKED buttons are LOCKED across all pages automatically. So if you intended to have something there, you need to move it.
The LOCK is doing exactly what it is supposed to.

Note: I see that your WebGUI did not show locked across all pages. That is interesting.