public void setBegin(YearMonthDay begin) { checkPermissionsToMakeOperations();
public void setBegin(YearMonthDay begin) {
    public void setBegin(YearMonthDay begin) {		checkPermissionsToMakeOperations();        checkExtensionSpaceOccupationIntersection(begin, getEnd(), getExtension());        super.setBegin(begin);    }