Field combination from one table that doesn't exist in another

[BrianFawcett]

I am trying to create a query which I am going to use to build a report. What I need to do is create a condition in the query where i want to return the records for one Table (RFQ Sent) where there are not a corresponding combination of two field (Supplier and Part) in a second table (RFQ received). Can anyone help me out?

 

[DCrake]

Look at the Unmatched query wizard