My 5 year old Basenji (we have had her since March) goes to the bathroom on our deck. We put her out the back door onto our deck and she usually goes no further tan the deck to go to the bathroom. Is there any way that I can stop this from happening?
Bathroom training
Have you tried walking her to the location you want her to go potty at?? They usually respond to consistency. If you walk her over on a leash to the place where you want them to go they'll get used to that each time & look for their scent to "go" where they should.
Hope this helps. 
My 5 year old Basenji (we have had her since March) goes to the bathroom on our deck. We put her out the back door onto our deck and she usually goes no further tan the deck to go to the bathroom. Is there any way that I can stop this from happening?
Put her on a leash and walk her to where you want her to go every time. Praise her when she goes, then let her off her least to run around.