92 Compliant // Update Statement

I am currently working on converting historical data in a Basis BBj environment.  With I am doing what would seem to be fairly straight forward UPDATE STATEMENTS - trying to updated tbl a with data from tbl b - Anyway I have tried this a few different ways without success.  I have been told that the Basis BBj environment that I am woking in is only SQL 92 Compliant and that is the reason I continue to get Syntax Errors -- so, without further ado here is what I have tried / with the results ----

UPDATE ARHI_1
SET DESCRIPTION = B.DESCRIPTION
FROM INVE B
WHERE ITEM_NO_JOB_ID = B.ITEM_ID

RETURNED  . . . . .

UNABLE TO EXECUTE SQL STATEMENT: Syntax error in SQL statement at 'UPDATE ARHI_1
SET DESCRIPTION = B.DESCRIPTION
<<<<FROM>>>> INVE B
WHERE ITEM_NO_JOB_ID = B.ITEM_ID'.

------------------------------------------------------------------------------------------------------------------------------------

UPDATE ARHI_1

INNER JOIN INVE B

ON ARHI_1.ITEM_NO_JOB_ID = B.ITEM_NO_JOB_ID

SET ARHI_1.DESCRIPTION = B.DESCRIPTION;

WHERE ARHI_1.ITEM_NO_JOB_ID = '00-00-01'

RETURNED  . . . . .

UNABLE TO EXECUTE SQL STATEMENT: Syntax error in SQL statement at 'UPDATE ARHI_1

<<<<INNER>>>> JOIN INVE B

ON ARHI_1.ITEM_NO_JOB_ID = B.ITEM_NO_JOB_ID

SET ARHI_1.DESCRIPTION = B.DESCRIPTION;

WHERE ARHI_1.ITEM_NO_JOB_ID = '00-00-01''.

-------------------------------------------------------------------------------------------------------------------------------------

UPDATE ARHI_1

SET DESCRIPTION = (SELECT DESCRIPTION

                                                FROM INVE

                                                WHERE ARHI_1.ITEM_NO_JOB_ID = INVE.ITEM_ID)

WHERE ARHI_1.ITEM_NO_JOB_ID = '00-10-001

RETURNED  . . . . .

UNABLE TO EXECUTE SQL STATEMENT: Syntax error in SQL statement at 'UPDATE ARHI_1

SET DESCRIPTION = (<<<<SELECT>>>> DESCRIPTION

                                                FROM INVE

                                                WHERE ARHI_1.ITEM_NO_JOB_ID = INVE.ITEM_ID)

WHERE ARHI_1.ITEM_NO_JOB_ID = '00-10-001''.

Could someone please show me how to accomplish this - in a way that is 92 Compliant?

Thank-you,

Max