Accounting software recommendation with document management

[shopper150]

I'm looking for accounting software that will allow me to get paperless.
i.e. I would like to be able to click on any entry, whether it's a purchase or a sale etc, and have the paperwork backing this transaction appear.
I've read a lot of recommendations for Xero and QuickBooks and wondered whether anyone could let me know how robust the document management is with these (or others).