Saving a custom entity with a notification script causes error

Hi there,

When attempting to save a changed value in a custom entity, we have a script set to execute that should check the value of a field and if the field is 100, a notification warning should be displayed on the form.  The field is set by a business rule, triggered from another field (a drop down option set).  Unfortunately, when we click save on the form, we get an undefined error:

There was an error with this field's customized event.

Field:crmForm

Event:onsave

Error:undefined

Here is the code in question:

function formNotification()
{   
     //check if the value is Critical
   if (Xrm.Page.getAttribute("new_criticalityvalue").getValue() = 100)
       {
         //set the notification with an error icon
//         Xrm.Page.ui.setFormNotification("Warning!  If you choose critical, you commit that this Idea must be completed or this specific Opportunity is completely DEAD.  You are also committing to a > 50% PoA if this Idea is implemented. ", "WARNING", "critical");
//      }
//    else
//     {
       //clear the notification
//       Xrm.Page.ui.clearFormNotification("critical");
     }
  }

Is there anything that I need to change in the code?  I checked the name of the field "new_criticalityvalue" and it's accurate.

Thank you for your help!

Best Regards,

Eric