Hello,
Are you able to complete work order from backend?. Have you debugged and see where its failing, if still an issue, please paste the logs here.
You could refer below documents related to upgrade in general and WM6.2.
Planning and Implementing your SMP Agentry Upgrades
If your question has been answered, please mark this thread answered. See
How to close a discussion and why
Even if you have a solution, you could mention here, so that it helps others to understand what the solution turned out to be.
Thanks
Resmi