How to create transformer for Bundle Resource to map its elements to repeated resources

[sal4455]

I'm mapping Resources id(AllergyIntolerance.id) to "fullurl" element of Bundle Resource. I wrote below code to extract resource id :

and map FULLURL element of bundle resource using GUI:

Out of two AllergyIntolerance resources,
In first resource, fullurl resource id is showing "undefined":

In second resource,fullurl element is not getting mapped: