In your 'TMPL_IF NAME=EXPORT_VALUE' loop you would need a data structure like this:

SCHEDULE_ROWS => [
    {
        SCHEDULE_COLUMNS => [
            { SCHEDULE => 'value' },
            { SCHEDULE => 'value' },
        ],
    },
]
[download]

And in 'TMPL_IF NAME=IMPORT_VALUE' loop you would need this:

SCHEDULE_ROWS => [
    { SCHEDULE => 'value' },
    { SCHEDULE => 'value' },
]
[download]

But in your code you have:

$data_structure{SCHEDULE_ROWS} = \@schedule_rows_loop;
$data_structure{SCHEDULE_COLUMNS} =\@schedule_columns_loop;
[download]

which gives you:

SCHEDULE_ROWS => [
    { SCHEDULE => 'value' },
    { SCHEDULE => 'value' },
],

SCHEDULE_COLUMNS => [
    { SCHEDULE_COLUMNS_COUNT => 'value' },
    { SCHEDULE_COLUMNS_COUNT => 'value' },
]
[download]

Try changing the template to:

<TMPL_LOOP NAME=SCHEDULE_ROWS>
    <tr>                    
        <td><b><TMPL_VAR NAME=SCHEDULE></b></td>
    </tr>
</TMPL_LOOP>    

<TMPL_LOOP NAME=SCHEDULE_COLUMNS>
    <tr>                    
        <td><TMPL_VAR NAME=SCHEDULE_COLUMNS_COUNT></td>
    </tr>
</TMPL_LOOP>
[download]

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