etl - Sparse lookup for tracking used records -

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i have scenario have claim application table , application claimant table. need sparse application claimant id application claimant table using ssn key. problem there multiple application claimant ids same ssn. pull ones not used in claim_application table. using sparse below query. 

select ssn, claim_application_claimant_id   claim_application_claimant   orchestrate.claim_application_claimant_id not in (      select claim_application_claimant_id       claim_application )

but when going map key expression in lookup stage, throwing below error.

key expression cannot set on key columns of link.the connected stage defines key lookup

what issue here?

i baffled please explore these options.

  1. in nested query add distinct clause , clause equate ssn between both tables

  2. try alternate approach involving use of joins.

  3. try using sql minus operator if columns equal in number


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