Hi @Vik , just taking a quick look at the overhaul and noticed this removal.
what if you replace this block with
if ($GLOBALS['erx_enable']) {
$viewArgs['title'] = 'Prescription History';
$viewArgs['btnLabel'] = 'Add/Edit eRx';
$viewArgs['btnLink'] = "{$GLOBALS['webroot']}/interface/eRx.php?page=compose";
} elseif ($GLOBALS['weno_rx_enable']) {
$viewArgs['title'] = 'Prescription History';
$viewArgs['btnLabel'] = 'Add/Edit eRx';
$viewArgs['btnLink'] = "{$GLOBALS['webroot']}/interface/weno/indexrx.php";
} else {
$viewArgs['btnLink'] = "editScripts('{$GLOBALS['webroot']}/controller.php?prescription&list&id=" . attr_url($pid) . "')";
$viewArgs['linkMethod'] = "javascript";
$viewArgs['btnClass'] = "iframe rx_modal";
}