JQuery autocomplete fills all fields

$(document).ready(function() {
	
	 $(".quantity").keydown(function(event) {
        // Allow: backspace, delete, tab, escape, and enter
        if ( event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 || 
             // Allow: Ctrl+A
            (event.keyCode == 65 && event.ctrlKey === true) || 
             // Allow: home, end, left, right
            (event.keyCode >= 35 && event.keyCode <= 39)) {
                 // let it happen, don't do anything
                 return;
        }
        else {
            // Ensure that it is a number and stop the keypress
            if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
                event.preventDefault(); 
            }   
        }
    });
	
    $counter = 1;
    $('#buttonadd').click(function() {
        $counter++;
        $('#invoiceitems > tbody:last').append('<tr><td><input type="button" class="deleteitem" value="Delete"/></td><td><input type="text" name="item[' + $counter + '][code]" id="id' + $counter + '-1" class="code" value="" disabled="disabled"/></td><td><input type="text" name="item[' + $counter + '][desc]" id="id' + $counter + '" class="regular-text" value="" /></td><td>£<input type="text" name="item[' + $counter + '][price]" id="id' + $counter + '-3"class="price" value="0.00" disabled="disabled"/></td><td><input type="text" name="item[' + $counter + '][quantity]" id="id' + $counter + '-4" class="quantity" value="0" /></td><td>£<label class="subtotal">0.00</label></td></tr>');
     $('.quantity , .price , .code').unbind().on('change', function() {
        UpdateTotals(this);
    });
	
	// Use the .autocomplete() method to compile the list based on input from user
	
   $(".regular-text").autocomplete("client/inc/get_item_list.php", {
		width: 260,
		matchContains: true,
		mustMatch: true,
		minChars: 2,
		//multiple: true,
		//highlight: false,
		//multipleSeparator: ",",
		selectFirst: true
	});
	
	$('.regular-text').focus(function() {
    $('.regular-text').removeClass('onFocus'); /* remove focus state from all input elements */
    $(this).addClass('onFocus'); /* add focus state to currently clicked element */
    var currentId = $(this).attr('id');
    });
  
	$(".regular-text").result(function(event, data, formatted) {
		$(".code").val(data[1]);
		$(".price").val(data[2]);
			// Give focus to the next input field to recieve input from user
			$("input[class='quantity']").focus();
    });
	
    });
	
	
  // Use the .autocomplete() method to compile the list based on input from user
   $(".regular-text").autocomplete("client/inc/get_item_list.php", {
		width: 260,
		matchContains: true,
		mustMatch: true,
		minChars: 2,
		//multiple: true,
		//highlight: false,
		//multipleSeparator: ",",
		selectFirst: true
	});
	
	$(".regular-text").result(function(event, data, formatted) {
		$(".code").val(data[1]);
		$(".price").val(data[2]);
			// Give focus to the next input field to recieve input from user
			$("input[class='quantity']").focus();
	});
	  
    });

	
    $(function() {
    CalculateSubTotals();
    CalculateTotal();
    // Adding the change events for the Price and
    // quantity fields only..
    // Changing the total should not affect anything
    $('.quantity , .price').on('change', function() {
        UpdateTotals(this);
    });
    });

    function UpdateTotals(elem) {
    // This will give the tr of the Element Which was changed
    var $container = $(elem).parent().parent();
    var quantity = $container.find('.quantity').val();
    var price = $container.find('.price').val();
    var subtotal = parseInt(quantity) * parseFloat(price);
    $container.find('.subtotal').text(subtotal.toFixed(2));
    CalculateTotal();
    }

    function CalculateSubTotals() {
    // Calculate the Subtotals when page loads for the 
    // first time
    var lineTotals = $('.subtotal');
    var quantity = $('.quantity');
    var price= $('.price');
    $.each(lineTotals, function(i){
        var tot = parseInt($(quantity[i]).val()) * parseFloat($(price[i]).val());
        $(lineTotals[i]).text(tot.toFixed(2));
    });
    }

    function CalculateTotal() {
    // This will Itearate thru the subtotals and
    // claculate the grandTotal and Quantity here
    var lineTotals = $('.subtotal');
    var quantityTotal = $('.quantity');
    var grandTotal = 0.0;
    var totalQuantity = 0;
    $.each(lineTotals, function(i) {
        grandTotal += parseFloat($(lineTotals[i]).text());
        totalQuantity += parseInt($(quantityTotal[i]).val())
    });

    $('.totalquantity').text(totalQuantity);
    $('.grandtotal').text(parseFloat(grandTotal).toFixed(2));
    };

<table border="0" id="invoiceitems">
                    <thead>
                        <tr>
                        <td></td>
                        <td><strong>Item ID</strong></td>
                        <td><strong>Description</strong></td>
                        <td><strong>Unit Cost</strong></td>
                        <td><strong>Quantity</strong></td>
                        <td><strong>Total</strong></td>
                        </tr>
                    </thead>
                    <tfoot>
                        <tr>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td><strong>Total:</strong></td>
                        <td>£<label class="grandtotal"></label></td>
                        </tr>
                    </tfoot>
                    <tbody>
                    <tr>
<td><input type="button" class="deleteitem"  value="Delete"/></td>
<td><input type="text" name="item[1][code]" id="id1-1" class="code" value="" disabled="disabled"/></td>
<td><input type="text" name="item[1][desc]" id="id1" class="regular-text" value="" /></td>
<td>£<input type="text" name="item[1][price]" id="id1-3" class="price" value="0.00" disabled="disabled"/></td>
<td><input type="text" name="item[1][quantity]" id="id1-4" class="quantity" value="0" /></td>
<td>£<label class="subtotal"></label></td>
</tr>
                    </tbody>
                    </table>
                    <p><input type="button" id="buttonadd" value="Add Line"/></p>