Hi Luis,
Can you please clarify if the objecitve function value obtained in the second model solve include the objective constant obtained by fixing binary variables to solution of first solve. If it includes the constant then the objective function value of the second model should be equal to that of the first. If not can you please open a technical support request here http://support.sas.com/ctx/supportform/createForm
with the data and I can look into it.
Thanks and Regards,
Amar
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