I have QUERY A that is based on a join between QUERY B and a TABLE 1. The join matchs the following fields from both QUERY B AND TABLE 1 : transdate, custid and item. The query works fine without any criteria. However if I add the criteria that these three fields from TABLE 1 be null, the query results with an error message: "Record set not updatable." Do you know what's causing this and how I can eliminate the error ?