insufficient privilege to select from database view

Dear experts,

I cannot execute sql select from database view, below is my steps.

1. logon HANA studio with SYSTEM user, create 4 users USER_A, USER_B, USER_C and USER_D;

     CREATE USER USER_A PASSWORD Initial1;

     CREATE USER USER_B PASSWORD Initial1;

     CREATE USER USER_C PASSWORD Initial1;

     CREATE USER USER_D PASSWORD Initial1;

2. logon HANA studio with user USER_A and create table T_TEST in schema USER_A as following:

     CREATE TABLE USER_A.T_TEST (ID INTEGER);

3. logon HANA studio with USER_A and grant select privilege on schema USER_A to USER_B,USER_C and USER_D;

     GRANT SELECT ON SCHEMA USER_A TO USER_B;

     GRANT SELECT ON SCHEMA USER_A TO USER_C;

     GRANT SELECT ON SCHEMA USER_A TO USER_D;

4. logon HANA studio with USER_B and grant select and create any privilege on schema USER_B to USER_C and USER_D;

     GRANT SELECT ON SCHEMA USER_B TO USER_C;

     GRANT SELECT ON SCHEMA USER_B TO USER_D;

     GRANT CREATE ANY ON SCHEMA USER_B TO USER_C;

     GRANT CREATE ANY ON SCHEMA USER_B TO USER_D;

5. logon HANA studio with USER_C and create view V_TEST in schema USER_B as following:

     CREATE VIEW USER_B.V_TEST AS SELECT * FROM USER_A.T_TEST;

6. logon HANA studio with USER_D and execute below SQL:

     SELECT * FROM USER_B.V_TEST;

     then I receive error says: "insufficient privilege"

Question: step 4 already assign select privilege on schema USER_B to USER_D, why step 6 still show error? However, USER_C can execute 'SELECT * FROM USER_B.V_TEST' successfully because USER_C is owner of USER_B.V_TEST. Will appreciate much if you can explain how the authorization check during user USER_D executing 'SELECT * FROM USER_B.V_TEST'

Regards,

Guoliang Zhou