According to the help, this means that:
You tried to update data that is located on a page that is currently locked (for example by another user or by a form opened on your machine). In Access a page is a portion of the database in which record data is stored. Depending on the size of the records, a page may contain more than one record.
Possible causes:
- You tried to save a query that is being used by someone else. To save your query, wait for the other user to finish or enter a different name, and then try the operation again.
- You tried to use the Edit or Update method on a data page containing a record that is already open or locked.
Hope this helps,
Judith