Mapping issue

Hi,

I have typical mapping question in IDOC TO file The file is of type IDOC ( we are sending IDOC XML as target file)

The scenario is s, i have to populate a value in target segment of IDOC based on  the valye from source.

However the Source occurrence is more then target ( for e.g Surce occurs 5 time where as target nly 2 time)

Let's say source has

<Segment 1>

   <value 1>

   <value 2>

</Segment>

<Segment 2>

. <value 1>

<value 2>

</Segment>

<Segment 3>

. <value 1>

<value 2>

</Segment>

Now target will be only 2 iteration..

<Target1>

<result>

</Target1>

<Target2>

<result>

</Target2>

Result value would be

If value 1 = X

then Result = value 2

Please advice how to handle the context as they are at diff level..