From my humble experience with accounting software, you only need to validate something if it can’t be undone afterwards. In Manager no validation is necessary since you can simply undo the mistake which is a big part in Manager being user friendly and all.
Besides, “Validation” by making the user press a Validate button achieves exactly nothing if you think about it for a moment. It’s just another click.
Also, you can always take the time to look at the view screen right after you create something without need for any button.
I’ve responded to your post at face value but maybe there’s something else behind it. Does this 
idea help?