Using a map to turn a Flatfile schema into hierachical one

I am trying to create a map to convert a file consisting of just order lines into one with a order, order line hierarchy.  e.g.

Order1, Line1
Order1, Line2
Order2, Line3
Order3, Line4

into…

<Order>
   <OrderName>Order1</OrderName>
   <OrderLine>Line1</OrderLine>
   <OrderLine>Line2</OrderLine> 
</Order>
<Order>
   <OrderName>Order2</OrderName>
   <OrderLine>Line3</OrderLine>
</Order>
<Order>
   <OrderName>Order3</OrderName>
   <OrderLine>Line4</OrderLine>
</Order> 

I thought that this should be a simple task but…  

• If I just map one record format to the other then I get an <Order> node for each line on the input file.  
• However if I use a Looping functiod with a logical operator to suppress the creation of the <Order> node for the second line of the input file, it also suppress the creation of the <OrderLine> node.

Can anyone give me some pointers to what I should be doing?

Many thanks,

Neil