I have use old version of JoomShopping it show botton can cancel discount code.
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Joomla: 3.4.5
JoomShopping: 4.11.3
PHP: 5.3.29
MySQL: 5.5.31
Website Url: http://localhost
JoomShopping: 4.11.3
PHP: 5.3.29
MySQL: 5.5.31
Website Url: http://localhost