I have a solution that I exported both as managed and unmanaged. I imported the managed one in an a CRM 2011 trial account without any issues. Now I tried to import the unmanaged solution on another trial account and get the following error:
When retrieving for a single row for a non-primary key query, only 1 value must be retrieved.
The report did work just fine when I tested it and as I said it imported ok as a managed solution. So why is this breaking? Unfortunately, I don't have the account anymore from which I exported the original solution so I can't re-export it.