Well, this time I punched in 1A and it did swap from B back to A. This was in a Unit that didn't have any waypoints preset in the Mission Editor. I ran OpenBeta this time without any 3rd Party Mods, except for Civil and Military Aircraft Mods enabled.
For the Record A1 did not work as an entry for a Steerpoint.
Here is the track of it working fine swapping back and forth. I don't know why I wasn't able to swap Steerpoints from B to 1A on the 4YA Aerobatics server.
F-15E Steerpoint B Test.trk
Talvid's post in Steerpoint stuck on B was marked as the answer