The software center knows about the install (the presence of BA), but was not the tool used to install it, or probably more correctly, was not an official install package, it won't mess with it. I can see the logic in this, as Ubuntu likes to do things certain ways through the SC. The SC will install .deb files from 3rd parties, but once you install it, does not do much to track it, as an official repository package would. At least this is the behaviour I have seen with third party .deb installs.
UNIX Systems Engineer
Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. (John 14:6 AV)