Custom Validation disables validation on required fields

Hi.
I was able to use the custom validation hook to write up a validation for a VIN field on my form. Works awesome, was able to include checks for caps, string length, certain characters - amazing.

Problem is, when the function is in there, it disables validation on the other form fields... so as long as my custom validation is active, required fields don't show errors.
When I remove it, my VIN field doesn't get checked (of course) but validations return for everything else.

Does this mean that if I use custom validation, I have to define new checks for each field in my form?

http://www.pastie.org/1704099

Here is the code that I am using for the VIN validation. It hits it with several checks as you'll see.

The form is here:
http://tinyurl.com/4tevcnb

You will need to login as a test user (upper right link).
u: anotherone
p: password

You can then see the GF. It creates a post to a CPT for Cars.
All of the fields are required (except for description).
Without my function above, all the other fields will show an error if left blank. With it, only the VIN field will show an error.

Amazing.
I was also missing

$validation_result["is_valid"] = false;
$form = $validation_result["form"];

From right after the comment saying it was coming up... adding that in and commenting out that line you suggested and looks great.

If you don't mind (because my brain works that way), what was that line I commented out doing? Was it hijacking that $form variable I needed for other purposes?

One last thing... I got hasty when I entered the title of the post and the permalink to this topic is completely unhelpful - could you adjust it so it reads more like what the actual title of the post is?

Thanks for ALL your help!

Found the issue... I had a line in the wrong place...

$validation_result["is_valid"] = false;

Had to go as part of the error code in this block:

$validation_result["is_valid"] = false;
$form["fields"][0]["failed_validation"] = true;
$form["fields"][0]["validation_message"] = "The Calculated VIN Check Digit is Incorrect";

In the code above I had it only once above with the "set form validation to false block" like it is in the doc:
http://www.gravityhelp.com/forums/topic/validate-input#post-19083