def _entry_must_exist(df, k1, k2):
count = df[(df['<STR_LIT>'] == k1) &<EOL>(df['<STR_LIT>'] == k2)].shape[<NUM_LIT:0>]<EOL>if count == <NUM_LIT:0>:<EOL><INDENT>raise NotRegisteredError(<EOL>"<STR_LIT>".format(k1, k2))<EOL><DEDENT>
Evaluate key-subkey existence.

    Checks that the key-subkey combo exists in the
    configuration options.