Conditional Logic with Validation

I'm having an issue with a my post updating when I have a required field that is hidden Conditional Logic. The field shows when a choice is selected in dropdown. How can I get this to work?

Here is how it works:
I have a required select_advanced field called Status with 3 options: Available, Under Contract and Sold. I have another required field called Sold Price and only shows if "Sold" is selected in the Status field. Since my Sold Price field is required and hidden, I can't update my post without having validation issues.

Code:

// Start Fields
'fields' => array(

// SELECT ADVANCED - Status
  array (
    'id' => $prefix . 'status',
    'name'          => 'Status',
    'type'          => 'select_advanced',
    'placeholder'   => 'Select Status',
    'options'       => array(
      'Available'     => 'Available',
      'UnderContract' => 'Under Contract',
      'Sold'          => 'Sold',
    ),
  ),

// TEXT - Sold Price
  array (
    'id'      => $prefix . 'sold_price',
    'type'    => 'text',
    'name'    => 'Sold Price',
    'prepend' => '$',
    'hidden'  => array( $prefix . 'status', '!=', 'Sold' )
  ),
), // End Fields

// Start Validation
'validation' => array(
  'rules'  => array(
    $prefix . 'staus' => array(
      'required'  => true,
    ),
    $prefix . 'sold_price' => array(
      'required'  => true,
    ),
  ),

) // End Validation