ORA-01401: inserted value too large for column

Seeing this on AIX 5.1 64 bit Oracle 9.2.0.1.0 with char datatypes. Anyone aware of this issue?

CREATE TABLE CHAR_TEST
(
  CHAR1 CHAR(1)
)

CREATE OR REPLACE PROCEDURE TEST_CHAR (
  po_out OUT CHAR_TEST.CHAR1%TYPE -- this column is defined as CHAR(1) )
IS
BEGIN      po_out := 'X';   

• The value assigned to po_out (in Oracle 9i instance) is an 'X' followed by 199 spaces.
• The value assigned to po_out (in Oracle 8i instance) is an 'X', no spaces. dbms_output.put_line('[BEGIN]-->' || po_out || '<--[END]');
• In Oracle 9i, the following will cause the exception: "ORA-01401: inserted value too large for column" INSERT INTO CHAR_TEST (CHAR1) VALUES (po_out);

EXCEPTION WHEN OTHERS
THEN
  dbms_output.put_line('Error: ' || SQLERRM); END;

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