Hi,
When solving a MIP LP file I have come across an issue where the solution reports back with "Model Unbounded" where I would expect it to find an optimal solution. ModelA.lp.bz2 is the file with the Model Unbounded issue. When I remove the constraint on line 6541 "+Y54 = 0" to create ModelB.lp.bz2 and solve I get an optimal solution of 1.132223170831e+03. When inspecting the result of ModelB, "Y54" variable is set to 0. Also, ModelA.lp.bz2 solves in CPLEX with the same optimal solution of 1.1322231708e+03.
Any ideas why ModelA may be returning Model Unbounded?
I have tested on both 6.5.0 and 6.5.1 with the same outcome.
Thanks.
Ben