CALLING SYSUUID in DDL

I am trying to create a table DDL in SAP HANA that populates UUID
when the user inserts records to the TEST table.

CREATE TABLE TEST
(
  TEST_ID        NUMBER(10)                     NOT NULL,
  TEST_NAME      NVARCHAR2(50)                  NOT NULL,
  UUID           NVARCHAR2(100)              SYSUUID  NOT NULL
);

But this statement fails and came to know calling SYSUUID in DDL is not supported. 

Then I tried to create a trigger as follows

CREATE TRIGGER TEST_TR
AFTER INSERT ON DIM
REFERENCING NEW ROW newRow
BEGIN
UPDATE TESTSET UUID = SYSUUID WHERE TEST_ID = :newRow.TEST_ID;
END;

now got the error message
SAP DBTech JDBC: [451]: modification of subject table in trigger not allowed: DEMO.TEST

Then I created a procedure to populate UUID as follows

create procedure Test(IN Testid Number) language SQLSCRIPT AS
BEGIN
UPDATE TESTSET UUID = SYSUUID WHERE TEST_ID = :Testid ;
END;

and calling this procedure in tigger

CREATE TRIGGER TEST_TR
AFTER INSERT ON DIM
REFERENCING NEW ROW newRow
BEGIN
CALL Test(:newRow.TEST_ID);
END;

Now get the following error

Could not execute 'CREATE TRIGGER TEST_TR AFTER INSERT ON DIM REFERENCING NEW ROW newRow BEGIN CALL ...' in 95 ms 671 µs .
SAP DBTech JDBC: [7]: feature not supported: call procedure is not supported in trigger

Please suggest a way to implement this SAP HANA. I dont like to implement this via application code.
I would like DB to populate UUID when the user inserts a record to the table.