In a MIP model with
, I face the problem that CPLEX does not return the "true" optimal solution to the problem.
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When I manually fix some binaries, I can increase the objective value (without breaking any constraints) by more than 1%.
I'm sure that this is caused by a mistake I made in setting up the model, but I can't seem to find it.
P.S.: I attached the model to this post, in there you may find the binary fixes that lead to the increased optimum at the end of the file (wrapped in $ontext/$offtext)