Not possible to update amazon_node

Are you working with version 4.7? The only thing you can edit is the book's rating. That's intentional, because amazon_node nodes should have nothing but data from Amazon.com.

Before I mark this 'by design," though, is there a reason I shouldn't?

Yes, and is so on my systems, both php4 and php5. I'm not running release candidates, though.

If you have a url where I can see this problem, email me.

No, I can't.

You know what? I want you to email me a copy of the 4.6 and 4.7 versions of the module you're running. Right now, the ASIN field in the 4.6 version is manditory (check the form_textfield() call in amazon_form() );

function amazon_form(&$node, &$param) {
  if (function_exists('taxonomy_node_form')) {
    $output = implode('', taxonomy_node_form($node->type, $node));
  }
  $output .= form_textfield('ASIN', 'ASIN', $node->ASIN, 15, 15, 'Enter the ASIN of the book.', '', TRUE);
  if ($node->type == 'amazon') {
    $output .= form_textarea('Body', 'body', $node->body, 60, 20);
    $output .= filter_form('format', $node->format);
  }
  return $output;
}

in 4.7 it always was.

function amazon_form($node) {
  $form = array();
  if (is_null($node->nid)) {
  	$form['asin'] = array(
    	'#type' => 'textfield',
    	'#title' => t('ASIN'),
    	'#default_value' => $node->asin,
    	'#size' => 20,
    	'#maxlength' => 20,
    	'#description' => t('Enter the ASIN of the item with no spaces or punctuation.'),
     	'#required' => TRUE,
  	);
  }
  else {
  	$form['asin'] = array(
    	'#type' => 'value',
    	'#value' => $node->asin,
  	);
  }
  $form['rating'] = array(
    '#type' => 'select',
    '#title' => 'Rating',
    '#options' => explode(',', 'Unrated,' . variable_get('amazon_ratings_labels', 'Poor, Below average, Average, Above average, Excellent')),
  );

  if ($node->type == 'amazon') {
    $form['title'] = array(
      '#type' => 'textfield',
      '#title' => t('Title'),
      '#default_value' => $node->title,
      '#size' => 20,
     	'#required' => TRUE,
    );
    $form['body'] = array(
      '#type' => 'textarea',
      '#title' => t('Body'),
      '#default_value' => $node->body,
      '#cols' => 60,
      '#rows' => 20,
    );
  }
  $form['format'] = filter_form($node->format);
  return $form;
}

And I'm just not having the problems you are. I need to see exactly what you're working with.

Okay, I duplicated the problem...kind of by accident, but I can do it at will. I think it qualifies as critical.

Okay, try a fresh download. I'll wait for your response before setting this as fixed, of course.