# Why cant we put a sequence generator or update strategy transformation before joiner transformation?

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Why cant we put a sequence generator or update strategy transformation before joiner transformation?
posted Sep 19, 2015

Joiner is to join two different sources .If u use Update strategy T.F and trying to use DD_delete&DD_reject option
the some of the data will get deleted and u can't see the at joiner output.
So we can't go for this .