SQL> Alter Table tb_hxl_hash
  2  Exchange Partition P_HS1 With Table tb_hxl_test;

Table altered.

SQL> Alter Table tb_hxl_hash
  2  Exchange Partition P_HS2 With Table tb_hxl_test;
Exchange Partition P_HS2 With Table tb_hxl_test
                                    *
ERROR at line 2:
ORA-14099: all rows in table do not qualify for specified partition

14099, 00000, "all rows in table do not qualify for specified partition"
// *Cause:  There is at least one row in the non partitioned table which
//          does not qualify for the partition specified in the ALTER TABLE
//          EXCHANGE PARTITION
// *Action: Ensure that all the rows in the segment qualify for the partition.
//          Perform the alter table operation with the NO CHECKING option.
//          Run ANALYZE table VALIDATE on that partition to find out the
//          invalid rows and delete them.