title: Strange "The totals of the cart item amounts do not match order amounts"
body: <p>I watched all the answers already present purpose they do not respond to my problem. I spent several days and really I do not understand.</p>
  
  <p>I use NVP method and i try to a very simple test SetExpressCheckout Configuration like this : </p>
  
  <pre><code>    $param = array('METHOD'=&gt;'SetExpressCheckout'
          , 'VERSION' =&gt;74.0
          , 'USER' =&gt; $user
          , 'SIGNATURE' =&gt; $signature
          , 'PWD' =&gt; $password
          , 'RETURNURL' =&gt; 'http://localhost/paypaltest/index.html'
          , 'CANCELURL' =&gt; 'http://localhost/paypaltest/cancel.html'
          , 'PAYMENTREQUEST_0_AMT' =&gt; 83.00
          , 'PAYMENTREQUEST_0_CURRENCYCODE' =&gt; 'EUR'
          , 'PAYMENTREQUEST_0_SHIPPINGAMT' =&gt; 10.00
          , 'PAYMENTREQUEST_0_ITEAMT' =&gt; 73.00
          );
  </code></pre>
  
  <p>normally <strong>AMT</strong> = <strong>ITEAMT</strong> + <strong>SHIPPINGAMT</strong> ??
  I try with 1 or two decimal but i have the same "Failure" error.
  What is strange is that if <strong>I remove SHIPPING AMT</strong>, it works and my total equals 83 on sandbox.</p>
  
  <p>Thanks for your help!</p>