ADO problem deleting rows in Excel table

I've used TADODataset to connect to a table in an Excel Workbook.
Everything works just fine except that when I try to delete records (rows),
the following error occurs: 'Deleting data in a linked table is not
supported by this ISAM'.
The underlying Excel worksheet is not linked to other worksheets.
Can anyone explain the meaning of this error message?

Tks
Ole Willy Tuv