Interesting way that they pose the question, since it isn't really the BA's code- however as there is no "I" in team- I would reply that first of all, if by "error" they are referring to a gap between what was a expected and what is shown in the code- I would normally minimize this prior to coding through various activities (and explain how, and what I did). If nevertheless, a gap was found, then a discussion would be held with the technical team to see if it could be corrected within the project timeline. If not, then it could be necessary to open a discussion with the client to negotiate, re-prioritize, etc.