queries that use aggregate functions are not updatable. Without me downloading your db -
what might work is if you create a select query that uses a field from your existing query that isn't using such a function as a field you equal join on. I can't say for sure as I don't think I've ever joined a Totals query (what you have) to a select query. The idea being that the select query is updatable (not sure without trying myself).
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.