OK, I'm new at this routing thing so be gentle… So I'm sketching a route and I come to a point where I want to tee instead of elbow. I make the turn in one direction and then erase the fillet and go in the other and apply the tee. It seems to route correctly but there is this lingering error that I cannot get rid of, any ideas?
Perhaps I miss understood you but if you first have placed an elbow but want to change it to a tee I think the best course of action is
1) do a crossing window across the area of the elbow and delete all in it
2) lenghten the original line (if he main trunk contineous that way or draw a line perpendicular to it if if the main trunk is that way
3) in case of the former , create the side branch by drawing a line perpendicular
4) drag and drop a T from your library on the sketch T and it should snap to it in the right size and correct direction
5) if you haven't drawn the side branch yet then before releasing it you can rotate the T with the tab-button
Now in your case what has happened, I think, is that there's still an entity left so that the program thinks that there should be an elbow
Do a crossing window across the general area and delete all
the worst that can happen is that you lose your T and have to reapply it