Jasper Domain - Item Name Can't Start with Numbers

[riodavid]

When we create the domains, there're some columns starting with numbers. The Domain Designer validated them successfully.

When we use them in Ad-Hoc View, an error popped up. It just said "An error occured", it won't tell you what the root cause is.

We have a big domain. It took us long time to locate the issue finally.

If you can't name items starting with numbers, why it passed Domain Designer validation? 

If something wrong happens, can we know where the error is? Just "An error occured" message is so pale.