Not enough rights to use table 'Common' (Common) error i Purchase Totals (PurchTotals)

You can get this error from Purchase Totals if the user does not have Edit permissions to Administration / Tables. Here's is how you can fix it by changing you security setup:
http://dynamics-ax-live.blogspot.com/2009/07/dynamics-ax-and-security-setup.html

You can also fix the issue by modifying the form. All you need to do is to change the "AllowCheck" property of the Common data source of the PurchTotals form. Change the value from "Yes" to "No".