Hello IBO support

Using D6 and IBO 4.2Hi.
I am using a TIB_DSQL to execute small scripts.

The following executes correctly:

ALTER PROCEDURE HELLO (INTEXT VARCHAR(7))
returns (OUT VARCHAR(7))
AS
begin
out = 'hello';
exit;
end

whereas the following produces the error message
"Unsupported Column type :0"

ALTER PROCEDURE HELLO (INTEXT VARCHAR(7))
returns (OUT VARCHAR(7))
AS
begin
out = :intext;
exit;
end

Any suggestions?

Thanks

Russell Belding