Custom Server Module Question

[CrunchyToast]

Good evening,

 

I am writing a custom module and had a question about upgrades/downgrades. Hopefully, this is the correct forum for such a question.

 

What I am interested in knowing is, I know I can stop/abort the ChangePackage command from running by using the following:

 

$return = array();
$return[] = array("abortcmd"=>true);
return $return;

 

...but is there a way to NOT processes the order, but display an error instead on the client side?

 

No matter what I have done, the order is still processed even if the abort command is ran. The order is still created, but the action does not take place.

 

Any help with this would be amazing! Thank you in advance.