Assign value to one column when etl process is run

hi,
i have a table with column etl_id. my requirement is when i ran one etl process this column is updated by 1. when i run etl process second time the value is 2. if i run n times its value should be n.
How do i implement this logic?
please find my table.
table name is WHOUSE_DS
CREATE TABLE OLAPS.WHOUSE_DS
(     ROW_WID NUMBER(10,0),
     INTEGRATION_ID NUMBER(10,0),
     DATASOURCE_NUM_ID NUMBER(10,0),
     ETL_ID NUMBER(10,0),
     WAREHOUSE_CODE VARCHAR2(30),
     WAREHOUSE_LOC_NAME VARCHAR2(30),
     WAREHOUSE_LOC_ADDRESS VARCHAR2(30),
     WAREHOUSE_LOC_CITY VARCHAR2(30),
     WAREHOUSE_LOC_COUNTY VARCHAR2(30),
     WAREHOUSE_LOC_STATE VARCHAR2(30),
     WAREHOUSE_LOC_COUNTRY VARCHAR2(30),
     ZIP_POSTAL VARCHAR2(30)
The bold column should be updated by 1 each time when i run the etl process.
Regards,
Jyothy

Hi Jyothy,
1.Define a Sequence Generator
2. Define a fuction ETL_ID_FN.
The function definition should be as follows.
Get the "Next Val" of Sequence generator and pass that value as a return value.
3. Import the funciton into OWB.
4. Open your mapping.
5. Use Constant Operator
6. Define a variable
7. In the defintion of varaible, call the imported function.
8. Validate it.
9. Assign it to the field whichever you want to.
Regards,
Gowtham Sen.

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DECLARE
@T TABLE
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datetime2,
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int,
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Assign value to one column when etl process is run

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