XCO framework expects C1-released database table

[#1]

Hi SAP-Community,

I am currently very desperate, and I count with your help.

In the ABAP Cloud context I am trying to get the information dynamically, if a field of a database table is a key field.

The relevant RTTI/RTTS objects are forbidden in the ABAP Cloud scope, so now I'm looking at the XCO framework.

Specifically, I try to do something like this (this is copied from the SAP documentation):

" Content handle for the field KEY_FIELD of database table ZMY_DBT.
DATA(lo_field_content) = xco_cp_abap_dictionary=>database_table( 'ZMY_DBT'
  )->field( 'KEY_FIELD'
  )->content( ).
" Get the complete content (i.e. all the available attributes of the field)
" as a structure of all attributes.
DATA(ls_field_content) = lo_field_content->get( ).
DATA(lv_key_indicator) = lo_field_content->get_key_indicator( ).

The problem is that when I'm trying to get the content (line 7), I get a CX_XCO_NEWS_EXCEPTION "Database table ZMY_DBT does not exist.

After some debugging, I found out, that the framework expects that ZMY_DBT is C1-released. But I cannot release database tables with C1.

This seems highly contradictory.

Did I find a bug or am I missing something?

What are alternative solutions to dynamically get the key indicator of a database table field (without creating a CDS View)? 

Thank you very much in advance!