Hello,
after a fast look I found a reference in the MS knowledge base:
http://support.microsoft.com/support/kb/articles/q109/8/00.asp
little excerpt:
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.
Bye !
Dr. Sbragion Denis
InfoTecna
Tel, Fax: +39 39 2324054
URL: http://space.tin.it/internet/dsbragio
