ADOTable connected to PostgreSQL - Can read table but can't write.

Running Windows XP.
Delphi 7 programming environment
Installed PostgreSQL.
Installed the PostgreSQL OLE Native driver.

Linked to PostgreSQL using ADOTable via a connection string

I can connect to and view the table  BUT if I try to add
(post) a record  I get a 'Field 'STREET' cannot be modified.'
That is I can READ but NOT WRITE to the table.

I'm I almost sure have set the table and schema permissions correctly
in PostgreSQL Admininstrator,

Has anyone used the ADOTable  component sucessfully in this way?

Any clues to solving this?

Thanks in advance.