BRFPLUS data object Level authorization

I want to give user Access BRFplus to maintain a specific decision table. I followed several notes I found in the community but unfortunately I was not successful. Even worse it's bloocking everything (error "You have no authorization to Display object functions for Profile operations"

I must say, that I have only some ABAP knowledge but now object programming knowledge.

What I have implemented so far:

1. Create role "ZBRF_BUSINESS" containing the ID of the decision table to be maintained

2. New Object type ZCL_APP_EXIT

3. Implement method "Constructor"

4. Authority Check

5. Test User with additonal role

Thank you for any help.
Regards,

Roland