How to use dual table in ODI in source side for nested queries?

Hi,
Any idea how to use dual table in source for more than once. I want to build a ODI interface for the following source query
SELECT ACTV_TYP.ACTV_TYP_SRC_CD, ACTV_TYP.ACTV_TYP, PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
SELECT LOW_VALUE PORT_ACTV_TYP_SRC_CD, MEANING PORT_ACTV_TYP
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS,
(SELECT 1 ACTV_TYP_SRC_CD, '?????' ACTV_TYP FROM DUAL
UNION ALL
SELECT 2 ACTV_TYP_SRC_CD, '???????' ACTV_TYP FROM DUAL) ACTV_TYP
Regards

If the below query is equivalent , it seems you don't need dual table at all , just default the values in the interface.
You are using dual tables to populate values ACTV_TYP.ACTV_TYP_SRC_CD, ACTV_TYP.ACTV_TYP values. Look at your query in the following manner :
SELECT '1', '?????', PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
SELECT LOW_VALUE PORT_ACTV_TYP_SRC_CD, MEANING PORT_ACTV_TYP
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS
UNION
SELECT 2 , '??????', PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
SELECT LOW_VALUE PORT_ACTV_TYP_SRC_CD, MEANING PORT_ACTV_TYP
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS
Now you can use dataset to make UNION.

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