bool checkStyle = false;
bool checkColor = false;
foreach (ConfigAttribute attr in config.Attributes)
{
	if (checkStyle && checkColor)
		break;

	if (attr.val_Name == "Style")
	{
		// Check the style
		if (attr.Selection.GetStringValue() == "Modern")
			checkStyle = true;
		else
			return ""; // No need to continue
	}
	else if (attr.val_Name == "Color")
	{
		// Check the color
		if (attr.Selection.GetStringValue() == "Wood")
			checkColor = true;
		else
			return ""; // No need to continue
	}
}
if (checkStyle && checkColor)
{
	// Apply the restriction: change the minimum value to '20'
	range.MinValue = 20;
}
return "";