Hi Prince,
Check above reply Query if its working for you or not.
Please also check below Queries.
SELECT DISTICT 'TRUE' FROM OPOR T0 WHERE $[OPOR.U_test] = 'EU'
OR
SELECT DISTICT 'TRUE' FROM OPOR T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode WHERE T1.[CardCode] = $[$4.0.0] and $[OPOR.U_test] = 'EU'
Hope this help
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Regards::::
Atul Chakraborty