Plan output database Performance degrade

Hi DBA,

the process has low performance by a statement  consult the table PRODDDTA.F3111Z1

SELECT  *  FROM PRODDDTA.F3111Z1  WHERE  ( SZEDUS = :KEY1 AND SZEDBT = :KEY2 AND SZEDTN = :KEY3 AND SZEDLN = :KEY4 AND SZUKID = :KEY5 )

the statement Access through fields PK, but has a wrong plan because don't used totally that index,  we believe the issue is the NICODE configuration of datasource used by App.

(print attached)

     

use partial the index SKIP SCAN (not UNIQUE SCAN) and not colum  SZEDUS, SZEDBT y SZEDTN because the App send variables in format NCHAR (not CHAR) the reason is format UNICODE in conection?