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here is some code I did in beforeLoad that works and set values for user only:
function beforeLoadEvent(type, form, request) {
	if (type == 'copy') {
		var itemCount = nlapiGetLineItemCount('item');

		for (var i = 1; i &lt;= itemCount; i++) {
			nlapiSelectLineItem('item', i);
			nlapiSetCurrentLineItemValue('item', 'custcol_my_field', '');
			nlapiCommitLineItem('item');
		}
	}
}