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?

Ole Willy Tuv