How to refer to fact table to update the same fact table

Here is my scenario. Fact table is having measures basic_sal, Tax, net_sal with dimension key to employee dimension.
I neet to update the net_sal = basic_sal - tax in fact table.
I tried to do a map with fact_table as source and also target. but after deploying the map, it's not updating the net_sal to the existing rows. It's inserting the new rows with dimension key and net_sal columns. so now fact table is having the double the existing rows.
Thanks,
Srini.

Ola Srini,
We have some experience that updating a table while using that same table as source often takes a lot of time... Specially when the table contains a lot of data (which is mostly the case with fact tables).
You can use two solutions. Expand the mapping u use to fill the fact table... The calculations looks not that complex to me... But I could be wrong.
Other solution is to create a temp table where you store all sal types. You could load the fact table from this temp table. Disadvantage of this solution is maintenance of the temp table...
Regards,
Moscowic

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