I am using AIMMS for solving a planning problem in electrical engineering field. The optimization problem is a MILP. I have some variables that are defined to be binary but when the AIMMS solve the problem some of the binary variables have fractional values, which is weird.
I should mention that the relax status is used for solving linear version of MIP, but in the case that I am talking about the relax status variable is set to zero to have binary answers. Most of the answers are binary except for some of them that have fractional values.
I would be grateful if someone could help me to solve this issue.