function increaseApproval(address _spender, uint256 _addedValue) minGroup(groupPolicyInstance._default) whenNotPaused external returns (bool)
    {
        allowed[msg.sender][_spender] = (allowed[msg.sender][_spender].add(_addedValue));
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }