title: Magento customer/invoice/order id format
body: <p>Is there anybody who is able to tell me how to change the format of id's in Magento?</p>
  
  <p>I would like this format for invoice ID's: E-YYMM-#ID</p>
  
  <pre><code>Example: E-1310-028
  
  Where: E- = standart prefix
         1310 = year + month
         028 = invoice id
  
  Same for customers:
         E-005
         E-006
         E-007
  </code></pre>
  
  <p>I know this is tricky, but is there anybody who knows how to do this?</p>
  
  <p>Thanx in advance</p>