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: subsasgn_check.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/matlabbatch/@cfg_menu
    
    the code of the file until where you have to start completion: function [sts, val] = subsasgn_check(item,subs,val)

% function [sts, val] = subsasgn_check(item,subs,val)
% Perform assignment checks for .val, .labels and .values field. 
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: subsasgn_check.m 1862 2008-06-30 14:12:49Z volkmar $

rev = '$Rev: 1862 $'; %#ok

% Checks could include a check whether the number of elements in labels
% and values match, but this would require a method to add a label and a
% value simultaneously. 
% Also, a check whether .val is indeed in .values could be performed, if
% the .val field is filled after .values (which is not the case for
% current auto-generated code).

sts = true;
switch subs(1).subs
    case {'val'}

    
function [sts, val] = subsasgn_check(item,subs,val)

% function [sts, val] = subsasgn_check(item,subs,val)
% Perform assignment checks for .val, .labels and .values field. 
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: subsasgn_check.m 1862 2008-06-30 14:12:49Z volkmar $

rev = '$Rev: 1862 $'; %#ok

% Checks could include a check whether the number of elements in labels
% and values match, but this would require a method to add a label and a
% value simultaneously. 
% Also, a check whether .val is indeed in .values could be performed, if
% the .val field is filled after .values (which is not the case for
% current auto-generated code).

sts = true;
switch subs(1).subs
    case {'val'}
        sts = iscell(val) && (isempty(val) || numel(val) == 1);
        if ~sts
            cfg_message('matlabbatch:checkval', ...
                    '%s: Value must be a cell with zero or one elements.', subsasgn_checkstr(item,subs));
        end