Thank you very much Ozone, the problem looks similar
but I am unable to get the solution.
Could you please elaborate it more
This is my explain plan with with the hard-coded values

SELECT STATEMENT Optimizer=CHOOSE (Cost=3541 Card=2 Bytes=874)
  SORT (ORDER BY) (Cost=3541 Card=2 Bytes=874)
    CONCATENATION
      NESTED LOOPS (Cost=1775 Card=1 Bytes=437)
        NESTED LOOPS (Cost=1774 Card=1 Bytes=324)
          NESTED LOOPS (Cost=1773 Card=1 Bytes=236)
            NESTED LOOPS (Cost=1772 Card=1 Bytes=190)
              TABLE ACCESS (BY INDEX ROWID) OF UCSII_UNIT (Cost=1736 C
+ard=117 Bytes=9243)
                INDEX (RANGE SCAN) OF XIE1UCSII_UNIT (NON-UNIQUE) (Cos
+t=879 Card=117)
              TABLE ACCESS (BY INDEX ROWID) OF UCSI_ITEM (Cost=1 Card=
+1829857 Bytes=203114127)
                INDEX (UNIQUE SCAN) OF XPKUCSI_ITEM (UNIQUE) (Cost=2 C
+ard=1829857)
            INDEX (UNIQUE SCAN) OF XPKUCS_INV (UNIQUE) (Cost=1 Card=55
+8346 Bytes=25683916)
          TABLE ACCESS (BY INDEX ROWID) OF ULT_CUST_SALE (Cost=1 Card=
+60595 Bytes=5332360)
            INDEX (UNIQUE SCAN) OF XPKULT_CUST_SALE (UNIQUE) (Cost=1 C
+ard=60595)
        TABLE ACCESS (BY INDEX ROWID) OF ULT_CUST_MASTER (Cost=1 Card=
+115517 Bytes=13053421)
          INDEX (UNIQUE SCAN) OF SYS_C0017576 (UNIQUE) (Cost=1 Card=11
+5517)
      NESTED LOOPS (Cost=1775 Card=1 Bytes=437)
        NESTED LOOPS (Cost=1774 Card=1 Bytes=324)
          NESTED LOOPS (Cost=1773 Card=1 Bytes=236)
            NESTED LOOPS (Cost=1772 Card=1 Bytes=190)
              TABLE ACCESS (BY INDEX ROWID) OF UCSII_UNIT (Cost=1736 C
+ard=117 Bytes=9243)
                INDEX (RANGE SCAN) OF XIE1UCSII_UNIT (NON-UNIQUE) (Cos
+t=879 Card=117)
              TABLE ACCESS (BY INDEX ROWID) OF UCSI_ITEM (Cost=1 Card=
+1829857 Bytes=203114127)
                INDEX (UNIQUE SCAN) OF XPKUCSI_ITEM (UNIQUE) (Cost=2 C
+ard=1829857)
            INDEX (UNIQUE SCAN) OF XPKUCS_INV (UNIQUE) (Cost=1 Card=55
+8346 Bytes=25683916)
          TABLE ACCESS (BY INDEX ROWID) OF ULT_CUST_SALE (Cost=1 Card=
+60595 Bytes=5332360)
            INDEX (UNIQUE SCAN) OF XPKULT_CUST_SALE (UNIQUE) (Cost=1 C
+ard=60595)
        TABLE ACCESS (BY INDEX ROWID) OF ULT_CUST_MASTER (Cost=1 Card=
+115517 Bytes=13053421)
          INDEX (UNIQUE SCAN) OF SYS_C0017576 (UNIQUE) (Cost=1 Card=11
+5517)
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