[Couenne] Constrain violation

[Armando José De La Hoz Moreno]

Hi,  I have the following code that uses Pyomo and Couenne to optimize the
energy consumption of a pumping system. The code works; however, something
curious happens. I know the optimal result in advance, which is 3810. Most
of the time, I get that result, but in some cases, the constraint is
violated:

  # Restricciones de flujo total por sistema
            def flujo_restriccion_rule(model):
                yield (model.flujo_bb_1_fase_total +
model.flujo_bb_2_fase_total) - requerimientos_hidraulicos['BPC S1'][0] == 0
                yield (model.flujo_bb_1_fase_total +
model.flujo_bb_2_fase_total) - model.flujo_bpc_s1_total == 0
                yield model.flujo_bpc_s1_total -
requerimientos_hidraulicos['BPC S1'][0] == 0

            model.del_component('flujo_restricciones')
            model.flujo_restricciones = ConstraintList()

            for constraint in flujo_restriccion_rule(model):
                model.flujo_restricciones.add(constraint)
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