Updates on Views
Only a limited set of updates on views is supported because of problems that can occur. Updates are not supported on views that have more than one base table, or on any column whose source is not a simple column name (for example, set functions or computations). If the view was created using the With Check Option enabled in the Create View dialog, no updates or inserts are allowed on columns that are in the qualification of the view definition. For more information on the With Check Option control, see online help for the Create View dialog.
Updating is supported only if it can be guaranteed (without looking at the actual data) that the result of updating the view is identical to that of updating the corresponding base table.
Note: Updating, deleting, or inserting data in a table using views is not recommended. You cannot update or insert into a view with Query-By-Forms. You can update, delete, or insert with SQL statements, but you must abide by the following rules, keeping in mind that an error occurs if you attempt an operation that is not permitted.