Dynamic node mapping

Question

Hi everyone,
I have a scenario in which the source structure contains an indicator A and 1 or 2 source nodes (X & Y, both 0..unbounded). Node X will always be in there where Y will only be in there if A = true. Target node is T (0..unbounded). Now, they way I like it to work is if A = true then map Y -> T, else if A = false map X -> T.
However, the if function doesn't seem to work well with nodes.
To illustrate, in this scenario the mapping would produce 4 target nodes T, because A = true and occurence of Node Y is 4.
Any help appreciated. Thanks.
<A>true</A>
<X>
  <X1>bla</X1>
  <X1>bla</X1>
  <X1>bla</X1>
</X>
<X>
  <X1>bla</X1>
  <X1>bla</X1>
</X>
<Y>
  <Y1>bla</Y1>
  <Y1>bla</Y1>
  <Y1>bla</Y1>
</Y>
<Y>
  <Y1>bla</Y1>
  <Y1>bla</Y1>
</Y>
<Y>
  <Y1>bla</Y1>
  <Y1>bla</Y1>
</Y>
<Y>
  <Y1>bla</Y1>
  <Y1>bla</Y1>
</Y>

Answer 1

Hi jp,
createif based on A = true/false will only create the target node once but I want it to be there n times based on the occurence of the source node X or Y.
I've uploaded a screenshot to further illustrate the problem
http://www.flickr.com/photos/24514021@N04/3118023808/
ihFsmType is the indicator, if empty I'd like to use InvoiceHistory for the node mapping, if ihFsmType != empty then sfh_hist.