Characteristic relatioships with SQL script

Hi Gurus,

I try to create a very simple characteristic relationship based on SQL script (I'm on SAPKW74008 level).

I have done the next steps:

1. created a class with IF_RSPLS_CR_EXIT_HDB interface and CL_RSPLS_CR_EXIT_BASE superclass

2. in method GET_SQLSCRIPT_INFO filled schema and procedure name

3. created DERIVE procedure in HANA studio

4. in DBACOCKPIT maintained indexserver.ini file where planningengine has allow_non_readonly_sqlscript = yes

5. in my SQL procedure there is no "READS SQL"

6. created a characteristic relatioship based on my class with derivation

Still I get the next errors:

Could you please advise ?

P.S. Planning function type based on SQL script, as described here, works fine (in the beginning I had the same errors, but changing indexserver.ini file solved it in opposite to characteristics relatioship)

Thank You,

BR,