Hi Michael,
The attached XSN has a different schema from the Expense Report sample which you show in your screenshot above. My guess is that you attached your XSN over the QdExpenseReport sample. That isn't going to work since your schema is different. If that's what you did (and maybe it isn't, but just my guess...) you'll want to simply create a new doctype from the main Catalog view and attach MyCustomer.xsn to that and then create a database table to map to it.
This should all be in the Getting Started document. We do provide some free assistance to help people up front and we have a free weekly webinar we give on Thursdays so let us know if you are free and what time we can call to help debug.
Good luck!