You should never ever house two different snake species together. Technically speaking, you should never house two snakes of the SAME species together unless you are intent on breeding.
I recommend separating them immediately, even if I had to relocate the BP to a rubbermaid as mentioned above. As long as the temps and humidity are maintained, the BP & Boa will be fine.
EDIT: You're too fast for me, but its still good info.. So Im leaving it
Please take the time to read caresheets on your snakes as soon as possible. I am sure at some point someone gave you the impression housing the two snakes together was ok..It isnt

No telling what other misinfo you were given either directly, or from example. I hope these caresheets will be able to help you...
If you have any questions, please feel free to ask

Welcome to RTB
Here is a link for a Ball Python caresheet
http://www.redtailboa.net/modules.ph...ewarticle&id=5
Here is a link for a Boa caresheet:
http://www.redtailboa.net/modules.ph...ewarticle&id=4