This should be set on loading of the page.
It is done by a includes/common_functions around line 320
you should find a function.
Make sure your files are complete. (incomplete files can happen during uploading.)
Code:
function gen_get_store_ids() {
global $db;
$result_array = array();
$result = $db->Execute("select id, short_name from " . TABLE_CONTACTS . " where type = 'b'");
if (($_SESSION['admin_prefs']['restrict_store'] && $_SESSION['admin_prefs']['def_store_id'] == 0)
|| !$_SESSION['admin_prefs']['restrict_store']) {
$result_array[] = array('id' => '0', 'text' => COMPANY_ID); // main branch id
}
while(!$result->EOF) {
if (($_SESSION['admin_prefs']['restrict_store'] && $_SESSION['admin_prefs']['def_store_id'] == $result->fields['id'])
|| !$_SESSION['admin_prefs']['restrict_store']) {
$result_array[] = array('id' => $result->fields['id'], 'text' => $result->fields['short_name']);
}
$result->MoveNext();
}
return $result_array;
}