problem wit hsequence as primary key

Hi, I was insertingrows into a table and had this error:

Cannot insert a duplicate key into unique index stock_transactions_pkey

Now the primary key is inserted by this function:

CREATE FUNCTION "set_primary_key" () RETURNS text AS '
DECLARE
sequence_number text;
location_number text;
retval text;
BEGIN
location_number := to_char(get_loc_key(),''999MI'');
location_number := trim(both '' '' from location_number);
sequence_number := to_char(nextval(''location_seq''),''99999MI'');
sequence_number := trim(both '' '' from sequence_number);
retval := location_number || ''-'' || sequence_number;
RETURN retval;
END;
' LANGUAGE 'plpgsql';

which results in valuse like 12-1234 as a text primary key.

The location_seq is up to 100005 at the moment so how am I getting
duplicate primary keys?

--

*
* Rob Brown-Bayliss

*