Argh! Found the problem! Stupid me. There was a tiny typo in my cloned file in the very last line:
Code:
function keys() {
return array('MODULE_SHIPPING_USAGROUND_STATUS', 'MODULE_SHIPPING_USAGROUND_COST', 'MODULE_SHIPPING_USAGROUND_MODE', 'MODULE_SHIPPING_USAGROUND_HANDLING', 'MODULE_SHIPPING_USAGROUND_HANDLING_METHOD', 'MODULE_SHIPPING_USAGROUND_TAX_CLASS', 'MODULE_SHIPPING_USAGROUND_TAX_BASIS', 'MODULE_SHIPPING_TUSAGROUND_ZONE', 'MODULE_SHIPPING_USAGROUND_SORT_ORDER');
}
USAGROUND !=TUSAGROUND
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