Issue with Coupons Selection

Selecting the top-checkbox is not selecting all the coupons. Screenshot attached.
 

Hi,
I confirm the issue, this bug will be fixed in next OS Services Booking version. But to solve it, you can follow below steps:
1. Open file: root -> administrator -> components -> com_osservicesbooking -> coupon.html.php
2. Find:
<input type="checkbox" name="toggle" value="" onclick="checkAll(<?php echo count($rows); ?>);" />

and replace by
<input type="checkbox" name="checkall-toggle" value="" title="<?php echo Text::_('JGLOBAL_CHECK_ALL'); ?>" onclick="Joomla.checkAll(this)" />

Good luck
Dam