Another message mapping complex issue part 2

Question

Hi All.
In addtion to my previous question , thers has been another requirement.
I have to map one field on the condition of another field
the new source can be like this
<Header>
<seg24>
<matpos>10</matpos>
<seg12>
<matdesc>red</matdesc>
<length>100</length>
</seg12>
<seg12>
<matdesc>green</matdesc>
<length>200</length>
</seg12>
<seg12>
<matdesc>black</matdesc>
<length>300</length>
</seg12>
</seg24>
<seg24>
<matpos>20</matpos>
<seg12>
<matdesc>green</matdesc>
<length>200</length>
</seg12>
<seg12>
<matdesc>black</matdesc>
<length>300</length>
</seg12>
</seg24>
<seg24>
<matpos>30</matpos>
<seg12>
<matdesc>red</matdesc>
<length>500</length>
</seg12>
<seg12>
<matdesc>green</matdesc>
<length>800</length>
</seg12>
<seg12>
<matdesc>black</matdesc>
<length>900</length>
</seg12>
</seg24>
<seg24>
<matpos>80</matpos>
<seg12>
<matdesc>red</matdesc>
<length>400</length>
</seg12>
<seg12>
<matdesc>green</matdesc>
<length>800</length>
</seg12>
<seg12>
<matdesc>black</matdesc>
<length>900</length>
</seg12>
</seg24>
<LineItem>
<Itempos>30</Itempos>
<Itempos>10</Itempos>
</LineItem>
<LineItem>
<Itempos>20</Itempos>
<Itempos>80</Itempos>
<Itempos>90</Itempos>
</LineItem>
</Header>
seg12 is a sub segment of seg 24
the target can be like this
<Target>
<field1></field1>
<field2></field2>
<targetitempos></targetitempos>
<targetlength></targetlength>
</Target>
I have to create one <Target> node for each LineItem, in this case 2 <Target> node and map the first found <Itempos> to targetitempos
I have only to map the <lenght> to <targetlength>.if the <matdesc> is red.
for this I have to compare the Itempos and matpos.
first map <LineItem> -
> <Target>
then
<Itempos>  -
> split value  targetitempos
so far so good but my problem is when mapping the <length>
if <matdesc> is red
and
if Itempos (sort ascending )eq matpos
then
<length> -
> <targetlength>.
the result I am getting is 2 <Target> node
<Target>
<targetitempos>30</targetitempos>
<targetlength>500</targetlength>
</Target>
which is correct
but the second one is getting the targetlength from another <matpos> and putting it into the <Target> node with the <targetitempos> 20 , which is the first position of <Target> node 2
<Target>
<targetitempos>20</targetitempos>
<targetlength>400</targetlength>
</Target>
now <matpos>20 in seg 24 does nor have any lenght neither any seg12 but it is taking it from  another <matpos>
I have really tried with many options without help
Please suggest and many thaks.

Answer 1

Hi Samer,
This is due to you haven't check the condition for matdesc = "red" & if it "red" doesn't exists map blank.
for below iteration where matpos = 20 but there is no matdesc with 'Red'.
</seg24>
<seg24>
<matpos>20</matpos>
<seg12>
<matdesc>green</matdesc>
<length>200</length>
</seg12>
<seg12>
<matdesc>black</matdesc>
<length>300</length>
</seg12>
</seg24>
Thanks,
Jyoti