after a fast look I found a reference in the MS knowledge base:
Before you can edit an external ODBC table, the table must contain a unique
index. If you get the following error message, you might not have a unique
index on the table:
Can't perform operation; it is illegal.
You could also receive this error if the Data1.Recordset.Updatable flag is
not set to True. Also, if you set the Data1.Options property to 64
(SQL_PASSTHROUGH), the data control will not be updatable.
Hope it helps.
Dr. Sbragion Denis
Tel, Fax: +39 39 2324054
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