You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: checksubs_job.m
    path of file: ./repos/ExploreASL/External/SPMmodified/matlabbatch/@cfg_mchoice
    
    the code of the file until where you have to start completion: function [sts, vind] = checksubs_job(item, subs, dflag)

    
function [sts, vind] = checksubs_job(item, subs, dflag)

% function [sts vind] = checksubs_job(item, subs, dflag)
% Check whether a subscript reference is a valid reference in a job
% structure starting at item. subs(1) should have a subscript type of
% '.', and the subscript reference should be a tagname from item.val or
% item.values, depend