Reasoner is always satisfied

[fedeMarra]

I use Pellet owlapi version 3 and i would like to check if OWLObjectPropertyExpression between two classes exists. For example I have three different classes IC, study and organization where there are these restrictions:

• IC SubclassOf
  belongs to only organization
  part of only study
  With owlapi code I check if an OWLObjectPropertyExpressions array are validated or not.
  The code is following:

Set<OWLClassAxiom> tempAx = onto.getAxioms(a);
            for(OWLClassAxiom axiom : tempAx){
                for(OWLClassExpression  ex: axiom.getNestedClassExpressions()){
                    for(OWLObjectProperty o:ex.getObjectPropertiesInSignature()){
                        expression = df.getOWLObjectIntersectionOf(a, df.getOWLObjectAllValuesFrom(o, b));
                        expression = df.getOWLObjectSomeValuesFrom(a, df.getOWLObjectSomeValuesFrom(o, b));
                        if (reasoner.isSatisfiable(expression)) {
                            System.out.println("yes");

                            return true;
                        }
                        else return false;
                    }

Where 'a' in this case is IC class and 'b' is study or organization class. The reasoner in all cases returns always satisfied. Why? Is there another way to check the axioms for one class?
Thanks for the answer.

[LorenzBuehmann]

Your code just checks whether the class expression a SOME (o SOME b) is satisfiable, nothing more.