> I just cleared and reset the sql onprepare - it works fine
> but I think the re-prepare after setting fieldsreadonly otion
> would have worked to (didn't try that)

Not sure I understand what you are saying. I did not see any
reference in your earlier conversation about FieldsReadOnly,
only the attempt to assign Column.ReadOnly.

The thing to remember is that IBO does not have persistent
field definitions, all "persistent" attributes must come from
the Fields* and ColumnAttributes properties. So even if IBO
were to let you change assignments to columns they would not
necessarily remain around as long as you expect.

(There is also the added confusion of multiple column instances
depending on the configuration of the dataset. The column in
the data row, the column in the buffer row etc.)

--
Geoff Worboys
Telesis Computing