new TCGOCLVariableClassificator(oPostCondition);
for(TCGOCLAtom oActivePostExpression :
oClassificator.getClassifiedElementsInExpression(
VariableClassification.ACTIVE_DEPENDENT)) {
oClassificator.shiftSubexpressionToTheLeft(oActivePostExpression);
TCGOCLAtom oAtomPostExp = (TCGOCLAtom)oActivePostExpression;
// 1) precondition references the same active object as postcondition
// 2) expression is an operation (else a transformation is not possible)
if((TCGOCLExpressionHelperClass.conditionContainsReferenceToObject(