Problem in context changing ( message mapping )

source structure 
Message Name
Header(1)
 H1
 H2
LineItem(1)
Item(1-unbounded)
 I1
 I2
target structure
Message name
Header(1)
 H1
 status
LineItem(1)
Item(1-un)
 I1
 I2
The result for status should be as follows
if h1 = x then status = H1failed else if h2 = x then status = H2failed
else if I1 = x then status = I1failed else if I2 = x then status = I2failed.
Problem :
 It works perfect as long we have only one Item (Unbounded Tab).
But since it is unbounded we have more than one item tabs.
The mapping does not produce the status element.
 I tried removing the context of all the source fields, but still I coudnt produce the status element. I dont know where to change the context.
Can somebody help me with this issue.
Thanks in advance .
Disney.

Hi,
I was able to do it with the graphical mapping using standard functions only.
The output will have only one status , the place where the 1st error shows up..like it checks in header fields first, then it takes items one by one.
It is very big though & would be much simpler to do something like what stefan proposed.
Just for info this is the Text Preview for the Mapping i did...(Is there a way, if i have this to upload to a mapping?)
/ns0:MT_TRGT/Header=/ns0:MT_SRC/Header=
/ns0:MT_TRGT/Header/H1=/ns0:MT_SRC/Header/H1=
/ns0:MT_TRGT/Header/Status=iF(iF(const(), stringEquals(/ns0:MT_SRC/Header/H1=, const()), iF(const(), stringEquals(/ns0:MT_SRC/Header/H2=, const()), const())), not(stringEquals(iF(const(), stringEquals(/ns0:MT_SRC/Header/H1=, const()), iF(const(), stringEquals(/ns0:MT_SRC/Header/H2=, const()), const())), const())), ifWithoutElse(not(stringEquals(iF(concat(const(), index(/ns0:MT_SRC/Item/Items/I1=)), stringEquals(/ns0:MT_SRC/Item/Items/I1=, const()), iF(concat(const(), index(/ns0:MT_SRC/Item/Items/I2=)), stringEquals(/ns0:MT_SRC/Item/Items/I2=, const()), const())), const())), iF(concat(const(), index(/ns0:MT_SRC/Item/Items/I1=)), stringEquals(/ns0:MT_SRC/Item/Items/I1=, const()), iF(concat(const(), index(/ns0:MT_SRC/Item/Items/I2=)), stringEquals(/ns0:MT_SRC/Item/Items/I2=, const()), const()))))
/ns0:MT_TRGT/Items=/ns0:MT_SRC/Item=
/ns0:MT_TRGT/Items/Item=/ns0:MT_SRC/Item/Items=
/ns0:MT_TRGT/Items/Item/I1=/ns0:MT_SRC/Item/Items/I1=
/ns0:MT_TRGT/Items/Item/I2=/ns0:MT_SRC/Item/Items/I2=
Thanks,
Renjith.

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