PL/SQL :: Cannot Create Table After Change Schema With ALTER SESSION

SQL> ALTER SESSION SET CURRENT_SCHEMA = CLA_T3;

Session altered.
SQL> select sys_context('USERENV','SESSION_USER') current_user,
2 sys_context('USERENV','SESSION_SCHEMA') current_schema
3 from dual
4 ;

CURRENT_USER
--------------------------------------------------------------------------------
CURRENT_SCHEMA
--------------------------------------------------------------------------------
CSR_ETL
CLA_T3

SQL> set linesize 300;
SQL> /

CURRENT_USER
----------------------------------------------------------------------------------------------------
CURRENT_SCHEMA
----------------------------------------------------------------------------------------------------
CSR_ETL
CLA_T3

SQL> create table cla_t3.test (r number, b char(2));
create table cla_t3.test (r number, b char(2))
*
ERROR at line 1:
ORA-01031: insufficient privileges

SQL> create table test (r number, b char(2));
create table test (r number, b char(2))
*
ERROR at line 1:
ORA-01031: insufficient privileges

After Setting current schema to 'CLA_T3', I am unable to create table in cla_t3 schema.