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Rev 24043 Rev 24044
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        updateTotalAmount();
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        updateTotalAmount();
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    });
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    });
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    $('input[name$=item_id]').live('change', function() {
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    $('input[name$=item_id]').live('change', function() {
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    	var count=0;
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    	var count=0;
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    	var that = this;
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    	$(this).closest('table').find('tr').each(function(el){
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    	$(this).closest('table').find('tr').each(function(el){
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    		if($(el).find('input[name=item_id]').val()==$(this).val()) {
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    		if($(that).find('input[name=item_id]').val()==$(this).val()) {
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    			count += 1;
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    			count += 1;
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    		}
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    		}
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    	});
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    	});
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    	if(count==2) {
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    	if(count==2) {
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    		alert("item should not be repeated twice");
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    		alert("item should not be repeated twice");