Access is quite picky about what is allowed in any updateable query. You must
join on a primary key field of the query/table providing the update to value.
If you shared you SQL and table structures, someone might help you re-write
your query.

Signature
Duane Hookom
Microsoft Access MVP
> I am trying to use an Update query to replace the values in a table with the
> result of a select query but I keep getting the message 'Operation must use
> an updateable query'.
>
> Are Update queries not allowed to use data from Select queries?