ILOG CPLEX 11.0 User's Manual > Advanced Programming Techniques > Using Optimization Callbacks > Control Callbacks > Control Callbacks and Dynamic Search

Control callbacks are not compatible with dynamic search, a feature which explores a solution space in a way that departs from a conventional branch & cut tree.

Normally, ILOG CPLEX chooses whether to apply dynamic search or conventional branch & cut based on characteristics of the model. To benefit from dynamic search, a MIP must not include control callbacks. In the presence of control callbacks, ILOG CPLEX turns off dynamic search, issues a warning, and applies conventional branch & cut.

If you want to avoid this warning in an application where control callbacks are present, you can deliberately turn off dynamic search yourself by setting the MIP search parameter (MIPSearch, CPX_PARAM_MIPSEARCH) to 1 (one).