The "Sales Method Type" field in query will show if the transaction was through Daily, Advance, Group, or Online Sales. Because back office payments aren't a sales method, those will show as blank in the Sales Method Type column in your results. 
  1. On the Analysis tab click Information Library
  2. Click Add an ad-hoc query
  3. Select Revenue and click OK
  4. Highlight the Sales Orders node in the Browse for Fields In column on the left
  5. In the middle column drag the Sales Method Type field to the Results Fields to Display section
  6. Add any fields that you need to Include Records Where to filter on the type of revenue you'd like to see