ORA-14400: inserted partition key does not map to any partition

INSERT INTO COMPLAINT (MSISDN) VALUES ('9000000');

INSERT INTO COMPLAINT (MSISDN) VALUES ('9000000')

            *

ERROR at line 1:

ORA-14400: inserted partition key does not map to any partition

Check 

DBA_PART_TABLES

DBA_PART_KEY_COLUMNS

Include all those columns that are reported in DBA_PART_KEY_COLULMNS in the insert statement.

Here it is REQ_DATE

INSERT INTO COMPLAINT (MSISDN,REQ_DATE) VALUES ('9000000','09-APR-09');

1 row created.