Getting NULL with function in the select Query

Hi all,
SELECT
,a.TRANSACTIONAL_CURR_CODE
--,gl.CONVERSION_RATE
,get_rate(a.transactional_curr_code,NVL(gsob.attribute1,gsob.currency_code),a.conversion_type_code,TRUNC(a.ordered_date)) CONVERSION_RATE
FROM
oe_order_headers_all a,
oe_order_lines_all b,
gl_sets_of_books gsob
--gl_daily_rates gl
WHERE 1=1
and a.header_id         = b.header_id
--and from_currency = 'USD' --a.transactional_curr_code
--and conversion_type = 'Corporate' --a.CONVERSION_TYPE_CODE
--and conversion_date = '23-APR-12' --a.ORDERED_DATE
and a.header_id =1234;
With commented above Line
0.749400479616307
NULL                                        ---->Why i am getting NULL , i have a Value (0.07809)
18.521
Without comment above Code(Hardcoded Code or Commented Line)
18.521
0.749400479616307
0.07809
select transactional_curr_code,ORDERED_DATE from oe_order_headers_all
where header_id=1234
o/p:-
USD      '23-APR-12'
select CONVERSION_RATE from gl_daily_rates
where from_currency = 'USD' --transactional_curr_code
and conversion_type = 'Corporate' --CONVERSION_TYPE_CODE
and conversion_date = '23-APR-12' --ORDERED_DATE
--and to_currency = 'USD'
CONVERSION_RATE
18.521
0.749400479616307
0.07809
select gsob.attribute1,gsob.currency_code from gl_sets_of_books
where SET_OF_BOOKS_ID=1
gsob.attribute1 gsob.currency_code
USD                   USD

Hi ,
Same as below code in the Function
select CONVERSION_RATE from gl_daily_rates
where from_currency = 'USD' --transactional_curr_code
and conversion_type = 'Corporate' --CONVERSION_TYPE_CODE
and conversion_date = '23-APR-12' --ORDERED_DATE
and to_currency = 'USD'

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Hello Everybody!
Thank you for all your response!
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MANDT
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select vkorg abgru from ZADS into it_rej.
Earlier :
IT_REJ is a Work area:
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ABGRU TYPE VBAP-ABGRU,
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Now :
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ABGRU TYPE VBAP-ABGRU,
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Hi all,
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DB- Oracle 10g
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Edited by: Pramod Verma on Mar 5, 2013 4:59 AM
Updated query and added more details

>
Since I am using Trunc() in the where clause so timing should not matter much. Also I manually ruled out records which were updated after the job run.
>
The first rule of troubleshooting is to not let your personal opinion get in the way of finding out what is wrong.
Actually this code, and the process it represents, is the most likely CAUSE of the problem.
>
where trunc(updated_date) > = trunc(sysdate-3)
>
You CANNOT reliably use columns like UPDATED_DATE to select records for processing. Your process is flawed.
The value of that column is NOT the date/time that the data was actually committed; it is the date/time that the row was populated.
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Even worse, the next nights data pull will not see them either! That is because the next pull will pull data for 3/5/2013 but those records have a date of 3/4/2013. They will never get processed.
>
Job timing is 4am and 10pm EST
>
Another wrinkle is when data is inserted/updated from different timezones and the UPDATED_DATE value is from the CLIENT pc or server. Then you can get even more data missed since the client dates may be hours different than the server date used for the data pull process.
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As suggested I'd try merging the queries into a single SQL. You could also rewrite your IN clauses as JOINs and see if that helps, e.g.
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Hi,
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In this code there is no need to use of ENDSELECT and use corresponding fields of table itab.
select lgort clabs
from mchb
into corresponding fields of itab
WHERE matnr EQ mch1-matnr
AND charg EQ mch1-charg
AND werks EQ plant-werks.
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Getting NULL with function in the select Query

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