tELTPostgresOutput and Update option

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tELTPostgresOutput and Update option

I am baffled what to write in "WHERE clauses" textbox to make Update happen. Is there a clear sample how to use it exactly - I try to write there sourcetablenamealias.primary_key=targetable.primary_key (like it is in ELTmap) but it wont resolve
I have both source and target defined with the same primary key but ELT component does not seem to use them to update like ETL component does (when I leave "WHERE clauses" textbox empty I get an error that more than one match found for update so I assume i does not actually use it since my primary key is autogenerated unique sequence.

Re: tELTPostgresOutput and Update option

Here is grammar of update sql in postgresql:
Best regards
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