code: package org.optsol.project_scheduling.mrcpsp.cpm.constraints;
  
  import com.google.ortools.linearsolver.MPConstraint;
  import com.google.ortools.linearsolver.MPSolver;
  import com.google.ortools.linearsolver.MPVariable;
  import org.optsol.jdecor.core.AbstractConstraintManager;
  import org.optsol.jdecor.core.AbstractVariableManager;
  import org.optsol.jdecor.ortools.AbstractOrtoolsConstraintManager;
  import org.optsol.project_scheduling.mrcpsp.constants.shared.IConstants_MakespanUpperBound;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_V;
  import org.optsol.project_scheduling.mrcpsp.cpm.variables.DecisionVars_Cpm_Bwd;
  
  public class CPM_Bwd_c_InitProjectStart<CONST extends IConstants_V & IConstants_MakespanUpperBound>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        AbstractConstraintManager<MPSolver, CONST, MPVariable, MPConstraint>.ConstraintKey index)
        throws Exception {
  
      constraint.setLb(0.);
      constraint.setUb(0.);
  
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Cpm_Bwd.c, constants.get_dummy_activity_project_start()),
          1.);
    }
  }
  