I have some binary variables x_i in a MIP that I would like to see considered first for branching. I also would like the branch to be selected first to be x_i = 0. I understand I can achieve my first objective by setting the priority of that variable in a dir file. It is not clear how to achieve my second objective. Would I have to start playing with branching objects, i.e., XPRSaddcbchgbranchobject ? Is there an example for doing this?
Thanks in advance